Aceratherium Greek: without (a) horn (keratos) beast (therion)  
Aepycamelus Greek: high and steep (aipys) camel (kamelos) from its long neck
Aktautitan Atktau [site where first fossil was found] plus Greek: giant (titan)  
americanum Latin: from America  
Amynodon Greek: to ward off/threaten (amynos) teeth (odontos) reference to large tusks
Amynodontidae Latin: Amynodont family  
andrewsi named after paleontologist Roy Chapman Andrews (1884-1960)  
Anisodon Greek: unequal (anisos) teeth (odontes)  
antiquitatis Latin: old (antiquus)  
Aphelops Greek: smooth (apheles) face (ops) because of its lack of a horn
Archaeohippus Greek: ancient (archaios) horse (hippos)  
arikarense from the Arikaree River  
augustus Latin: majestic (augustus)  
Australopithecus Latin: southern (australis) and Greek: ape (pithekos)  
bairdii after American naturalist Spencer Fullerton Baird (1823-1887)  
Baluchitherium Baluch [reference to Baluchistan, where first fossil of this animal was found] plus Greek: beast (therion)  
Barylambda Greek: heavy (baros) lambda (lambda) reference to size of animal copared with Pantolambda
bicornis Latin: two (bi) horn (cornus)  
Bison Greek: wild ox (bison)  
Bootherium Greek: ox (boos) beast (therion)  
Bothriodon Greek: botros (pit) odontes (teeth)  
Brontops Greek: thunder (brontos) face (ops)  
Brontotheriidae Latin: Brontothere family  
Brontotherium Greek: thunder (brontos) beast (therion)  
caballus Latin: horse (caballus) equus is classical latin for horse; caballus is vulgar latin
Camelops Greek: camel (kamelos) face (ops)  
Canis Latin: dog (canis)  
Castoroides Latin: beaver (castor) like (oides)  
Ceratomorpha Greek: horn (keratos) form (morphos)  
Ceratotherium Greek: horn (keratos) beast (therion)  
Chalicotheriidae Latin: Chalicothere family  
Chalicotherium Greek: pebble (khalik) beast (therion) reference to pebble-like teeth of first fossil discovered
Coelodonta Greek: koilos (hollow) teeth (odontes)  
columbi Latin: of or relating to the United States [from Columbian]  
Coryphodon Greek: pointed (kentron) teeth (odontes)  
crassicornis Latin: heavy (crasseus) horn (corneus)  
curtum Latin: shortened (curtum)  
Dicerorhinus Greek: two (dio) horn (keratos) nose (rhinos)  
Diceros Greek: two (dio) horn (keratos)  
Dinohippus Greek: terrible (deinos) horse (hippos)  
Dinohyus Greek: terrible (deinos) pig (hyainos)  
Diplacodon Greek: double (diplos) point (aki) teeth (odontes)  
dirus Latin: dire or terrible  
Dolichorhinus Greek: long (dolichos) nose (rhinos) reference to the elongated snout and head of this brontothere
Ectoconus Greek: outside (ektos) cone (konos) reference to external cusp on upper molars
elatus Latin: uplifted (elatus)  
Embolotherium Greek: battering ram (embolos) beast (therion) reference to the ram-like nasal bones
Eohippus Greek: dawn (eos) horse (hippos)  
Eotitanops Greek: dawn (eos) giant (titan) face (ops)  
Equidae Latin: Horse family  
Equoidea Latin: Horse-like superfamily  
Equus Latin: horse (equus)  
Erithacus Greek: robin (erithacos)  
Gastornis Greek: Gaston's bird (ornis) named after its discoverer, French scientist Gaston Plante (1834-1889)
Glyptodon Greek: carved (glyptos) teeth (odontes)  
grande Latin: great (grandis)  
grangeri named after paleontologist Walter Granger (1872-1941)  
Hippomorpha Greek: horse (hippos) form (morphos)  
hippopotamopus Greek: river horse (hippopotamus) foot (opus)  
Homo Latin: man  
Homogalax Greek: lit. same (homo) milk (galactos) = "foster brother" refers to relatedness to other fossils
Hoplophoneus Greek: murder (phonos) weapon (hoplo)  
Hyaenodon Greek: hyena (hyainos) teeth (odontos)  hyena comes from the Greek word for pig - hyainos
Hypohippus Greek: under (hypos) horse (hippos)  
Hyrachyus Greek: hyrax (hyrak = 'shrewmouse') pig (hyainos)  
Hyracodon Greek: hyrax (hyrak = 'shrewmouse') teeth (odontos)  
Hyracodontidae Latin: Hyracodont family  
Hyracotherium Greek: hyrax (hyrak = 'shrewmouse') beast (therion)  
indicus Latin: from the Indies  
Indricotherium Russian: Indrik [mythical "father of all beasts"] plus Greek: beast (therion)  
insignis Latin: notable/distingished (insignis)  
johnsoni   Schultz et al 1975 - check Osborn Library
Loxolophus Greek: slanting (loxos) crest (lophos) reference to oblique crests of lower molars
major Latin: greater (maior)  
Mammalia Latin: mammals  
Mammut Tartar: ground dweller (mammantu) based on Tartar belief that frozen remains of mammoths were remains of giant mole-like creatures
Mammuthus Tartar: ground dweller (mammantu) based on Tartar belief that frozen remains of mammoths were remains of giant mole-like creatures
Manteoceras Greek: prophetic (manteos) horn (keratos) one of the earliest brontotheres to develop horns - albeit small ones
matthewi named after paleontologist William Diller Matthew (1871-1930)  
medicornutum Latin: middle (medio) horned (cornutum)  
Megacerops Greek: great (mega) horn (keratos) face (ops)  
Megahippus Greek: great (mega) horse (hippos)  
Megaloceras Greek: great (mega) horn (keratos)  
Megatapirus Greek: great (mega) plus Tupi (Brazilian indian): tapir (tapira)  
Megatherium Greek: great (mega) beast (therion)  
Menoceras Greek: crescent (meniskos) horns (keratos)  
Merychippus Greek: ruminant (merux)-like horse (hippos)  
Merycochoerus Greek: ruminant (merux)-like swine (khoiros)  
Mesohippus Greek: middle (meso) horse (hippos)  
Metamynodon Greek: after/beyond (meta) threatening (amynos) teeth (odontes)  
Metatitan Greek: after/beyond (meta) giant (titan)  
migratorius Latin: wandering (migrare)  
mongoliensis Latin: of/from Mongolia  
Moropus Greek: lit. dull (moros) foot (poys) = sloth foot was originally believed to be related to sloths
nebraskensis Latin: of/from Nebraska  
Neohipparion Greek: new (neos) pony (hipparion)  
Orohippus Greek: mountain (oros) horse (hippos)  
Oxyaena Greek: sharp (oksys) hyena (hyainos) hyena comes from the Greek word for pig - hyainos
Palaeoryctes Greek: old (palaeos) digger (oryctes)  
Palaeotheriidae Latin: Palaeothere family  
Palaeotherium Greek: old (paleos) beast (therion)  
Paleosyops Greek: old (paleos) boar (kapros) face (ops)  
Pantolambda Greek: all (pantos) lambda (lambda) a reference to the cusps of the upper premolars which are arranged in a pattern like the Greek letter lambda
Parahippus Greek: near (para) horse (hippos)  
Paramylodon Greek: near (para) millstone (mulos) teeth (odontes)  
Paramys Greek: near (para) mouse (mys)  
parvulum Latin: small/tiny (parvulus = little child)  
Pelycodus Greek: bowl (pelys ) tooth (odus)  
Perissodactyla Greek: uneven (perissos) finger (dactylos)  
Phenacodus Greek: imposter (phenax) tooth (odus)  
Poebrotherium Greek: grass-eating beast (therion)  
primigenius Latin: first (primus) born (gignere = to give birth do/bring forth)  
primus Latin: first (primus)  
Promerycochoerus Latin: before (pro) plus Greek: ruminant (merux)-like swine (khoiros)  
Propalaeotherium Latin: before (pro): plus Greek: old (paleos) beast (therion)  
Protapirus Latin: before (pro): plus Brazilian Indian: tapir (tapira)  
Protitanotherium Latin: before (pro): plus Greek: giant (titan) beast (therion)  
Protorohippus Latin: before (pro): plus Greek: mountain (oros) horse (hippos)  
quagga Xhosa: something striped (i-qwaxa)  
Repenomamus Latin: reptile (reptilis) mammal (mammalis)  
Rhinocerotidae Latin: Rhinoceros family  
Rhinocerotoidea Latin: Rhinoceros-like superfamily  
Rhinoceros Greek: nose (rhinos) horn (keratos)  
robustus Latin: strong (robustus)  
Rodentia Latin: rodents  
rubecula Latin: red breast  
sapiens Latin: wise  
scotti named after paleontologist William Berryman Scott (1858-1947)  
Sharamynodon Shara [site where fossil was first found] plus Greek: to ward off/threaten (amynos) teeth (odontos)  
skinneri named after paleontologist Morris Skinner (1906-1989)  
Smilodon Greek: chisel (smile) teeth (odontos)  
sondaicus Latin: from the Sunda Islands [incl. Borneo and Java]  
Subhyracodon Latin: below (sub): plus Greek: hyrax (hyrak = 'shrewmouse') tooth (odontos)  
sumatrensis Latin: from Sumatra  
Tapiridae Latin: tapir family  
Tapiroidea Latin: tapir-like superfamily  
Tapirus Brazilian indian: tapir (tapira)  
Teleoceras Greek: perfect (teleos) horn (keratos)  
Teratornis Greek: wonder (teretos) bird (ornis)  
terrestris Latin: of the earth (terra)  
Thylacodon Greek: pouch (thylacos) teeth (odontos)  
Titanotherium Greek: giant (titan) beast (therion)  
Trigonias Greek: triangular (trigonos) ias [denotes possession] reference to triangular cutting surface of first incisors
Tubulidentata Latin: tube (tubulis) tooth (dentis)  
Turdus Latin: thrush (turdus)  
Tylocephalonyx Greek: tylos (knob) head (kephalos) claw/hoof (onyx)  
unicornis Latin: one (unus) horn (cornus)  
Xenicohippus Greek: strange (xenikos) horse (hippos)