Graafian \Graaf"i*an\, a. (Anat.) Pertaining to, or discovered by, Regnier de Graaf, a Dutch physician.

Graafian follicles or vesicles, small cavities in which the ova are developed in the ovaries of mammals, and by the bursting of which they are discharged.

Source: Webster's Revised Unabridged Dictionary (1913)