leporine
A supposed hybrid between a hare and a rabbit, now known not to exist; a leporide.
historical
I come now to the more interesting part of my subject, viz. that of the Leporines—hybrids, so called, between the hare and the rabbit. It has been stated that M. Rouy, of Angoulême, has bred for the market a thousand of these Leporines yearly—that they are fertile both with the hare and the rabbit, and with each other.
Where it comes from
The adjective is a learned borrowing from Latin leporīnus + English -ine (suffix meaning ‘of or pertaining to’). Leporīnus is derived from leporis (the genitive singular form of lepus (“hare”)) + -īnus (suffix meaning ‘of or pertaining to’). The noun is derived from the adjective.
Adapted from the Wiktionary entry leporine (CC BY-SA 4.0).