Webster's Revised Unabridged Dictionary · 1913

Fornicate

Fornicate , adjective

[Latin fornicatus, from fornix, -icis, an arch, vault.]

1.
Vaulted like an oven or furnace; arched.
2.
(Botany) Arching over; overarched. — Gray

Also: Fornicated

Fornicate , intransitive verb

[Latin fornicatus, p. p. of fornicari to fornicate, from fornix, -icis, a vault, a brothel in an underground vault.]

To commit fornication; to have unlawful sexual intercourse.