[L. fossula, dim. of fossa: see FOSSA.] A small fossa; spec. a. Anat. ‘One of the numerous slight depressions on the surface of the cerebrum’ (1894, Gould, Dict. Med.). b. Zool. A vacant space representing one of the primitive septa of certain corals; more fully septal fossula.
1843. J. G. Wilkinson, trans. Swedenborg’s Anim. Kingd., I. i. 21. They lie on the base of the tongue in superficial crypts or fossulæ.
1879. Nicholson, in Encycl. Brit., VI. 382/1. The septal fossula.
