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From The Collaborative International Dictionary of English v.0.48:
Graafian \Graaf"i*an\, a. (Anat.) Pertaining to, or discovered by, Regnier de Graaf, a Dutch physician. [1913 Webster] 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. [1913 Webster]