fornix noun. ['fɔ:nɪks] Pl. -nices [-nɪsi:z]. L17.
[Latin = arch, vaulted chamber.]
A thing resembling an arch. Chiefly Anatomy, an arched organ or structure; spec. (a) (more fully fornix cerebri ['sɛrɪbrʌɪ]) a band of white fibres at the base of the brain; (b) any of the uppermost recesses of the vagina.

[TahlilGaran] English Dictionary ▲