Bible Dictionaries
Peristome

Webster's Dictionary

(1):

(n.) The fringe of teeth around the orifice of the capsule of mosses. It consists of 4, 8, 16, 32, or 64 teeth, and may be either single or double.

(2):

(n.) The lip, or edge of the aperture, of a spiral shell.

(3):

(n.) The membrane surrounding the mouth of an invertebrate animal.

Bibliography Information
Webster, Noah. Entry for 'Peristome'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/peristome.html. 1828.