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The Collaborative International Dictionary
Mammillate

Mammillate \Mam"mil*late\, Mammillated \Mam"mil*la`ted\, a. [See Mammilla.]

  1. Having small nipples, or small protuberances like nipples or mamm[ae].

  2. (Zo["o]l.) Bounded like a nipple; -- said of the apex of some shells.

Wiktionary
mammillate

a. 1 Having small nipples, or small protuberances like nipples or mammae. 2 Bounded like a nipple; said of the apex of some shells.