Resembling an animal; bestial.
- Dr. Ingrid Skinner disappeared with a number of theroid specimens that have mutated into monsters.
- His harrowing experience of exile has turned him into a theroid monster.
- In vain does Geology lay bare the Tertiary formation, with its enormous theroid mammalia, far surpassing in size the largest animals we are acquainted with.
Mid 19th century: from Greek thēr 'beast' + -oid.
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