Per"i*treme(?), n. [Pref. peri- + Gr. a hole.] (Zol.) (a) That part of the integument of an insect which surrounds the spiracles. (b) The edge of the aperture of a univalve shell.
Pe*rit"ri*cha(?), n. pl. [NL., fr. Gr. about + , , hair.] (Zol.) A division of ciliated Infusoria having a circle of cilia around the oral disk and sometimes another around the body. It includes the vorticellas. See Vorticella.
Per`i*tro"chi*um(?), n. [NL., fr. Gr. ; around + a wheel.] (Mech.) The wheel which, together with the axle, forms the axis in peritrochio, which see under Axis.
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Thu 13th December 2018