Etymology
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ther- 

often thero-, word-forming element meaning "beast," from Greek thēr "wild beast, beast of prey," from PIE root *ghwer- "wild beast." Also therio-, from Greek thērion "wild animal, hunted animal."

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shellfish (n.)

also shell-fish, "animal that lives in the water and has a shell," Old English scylfiscas (plural); see shell (n.) + fish (n.) in the old general sense of "aquatic animal."

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vet (v.)
"to submit (an animal) to veterinary care," 1891, from veterinarian. The colloquial sense of "subject (something) to careful examination" (as of an animal by a veterinarian, especially of a horse before a race) is attested by 1901. Related: Vetted; vetting.
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mink (n.)

early 15c., "skin or fur of the (European) mink," from a Scandinavian source (compare Swedish menk "a stinking animal in Finland"). Applied in English to the animal itself from 1620s, and extended to the related (but larger) animal of North America by Capt. John Smith (1624). Related: Minkery "an establishment where minks are bred and trained for ratting" (by 1862, American English).

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zoography (n.)
1590s, from zoo- "animal" + -graphy. Related: Zoographer; zoographic.
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zoophagous (adj.)
"carnivorous," 1840, from zoo- "animal" + -phagous "eating." Related: Zoophagy; zoophage.
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greenhorn (n.)
mid-15c., "horn of an animal recently killed," also "young horned animal," from green (adj.) in sense of "new, fresh, recent" + horn (n.). Applied to new soldiers from c. 1650; extended to any inexperienced person by 1680s.
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tetrapod (n.)
"four-footed animal, quadruped," 1826, from Modern Latin tetrapodus, from Greek tetrapous "four-footed," as a noun, "four-footed animal," from tetra- "four" (from PIE root *kwetwer- "four") + pous "foot" (from PIE root *ped- "foot").
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gabble (n.)
"senseless, loud, rapid talk; animal noise," c. 1600, from gabble (v.).
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sea-monster (n.)

"huge, hideous, or terrible marine animal," 1580s, from sea + monster. Sea serpent is attested from 1640s. In Middle English a sea-monster might be called sea-wolf; in Old English, sædraca "sea dragon," or sædeor "sea-animal."

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