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Per"i*stome (?), n. [Pref. peri- + Gr. &?;, &?;, mouth.] 1. (Bot.) 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. (Zoˆl.) (a) The lip, or edge of the aperture, of a spiral shell. (b) The membrane surrounding the mouth of an invertebrate animal.

Per`i*sto"mi*al (?), a. (Zoˆl.) Of or pertaining to a peristome.

||Per`i*sto"mi*um (?), n. [NL.] Same as Peristome.

Per`i*streph"ic (?), a. [Gr. &?; to turn round.] Turning around; rotatory; revolving; as, a peristrephic painting (of a panorama).

Per"i*style (?), n. [L. peristylum, Gr. &?;, &?;; &?; about + &?; a column: cf. F. pÈristyle.] (Arch.) A range of columns with their entablature, etc.; specifically, a complete system of columns, whether on all sides of a court, or surrounding a building, such as the cella of a temple. Used in the former sense, it gives name to the larger and inner court of a Roman dwelling, the peristyle. See Colonnade.

Per`i*sys"to*le (?), n. [Pref. peri- + systole: cf. F. pÈrisystole.] (Physiol.) The interval between the diastole and systole of the heart. It is perceptible only in the dying.

Pe*rite" (?), a. [L. peritus.] Skilled. [Obs.]

||Per`i*the"ci*um (?), n. [NL., fr. Gr. &?; around + &?; box.] (Bot.) ||An organ in certain fungi and lichens, surrounding and enveloping the ||masses of fructification. Henslow.

Pe*rit"o*mous (?), a. [Gr. &?; cut off all around. See Peri-, and Tome.] (Min.) Cleaving in more directions than one, parallel to the axis.

Per`i*to*nÊ"um (?), n. (Anat.) Same as Peritoneum.

Per`i*to*ne"al (?), a. [Cf. F. pÈritonÈal.] (Anat.) Of or pertaining to the peritoneum.

Per`i*to*ne"um (?), n. [L. peritoneum, peritonaeum, Gr. &?;, &?;, fr. &?; to stretch all around or over; &?; around + &?; to stretch.] (Anat.) The smooth serous membrane which lines the cavity of the abdomen, or the whole body cavity when there is no diaphragm, and, turning back, surrounds the viscera, forming a closed, or nearly closed, sac. [Written also peritonÊum.]

||Per`i*to*ni"tis (?), n. [NL. See Peritoneum, and -itis.] (Med.) ||Inflammation of the peritoneum.

Per`i*tra"che*al (?), a. (Zoˆl.) Surrounding the tracheÊ.

Per"i*treme (?), n. [Pref. peri- + Gr. &?; a hole.] (Zoˆl.) (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.] ||(Zoˆl.) 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.

Per*it"ro*pal (?), a. [Gr. &?;, fr. &?; to turn around; &?; around + &?; to turn: cf. F. pÈritrope.] 1. Rotatory; circuitous. [R.]

2. Having the axis of the seed perpendicular to the axis of the pericarp to which it is attached.

Per*it"ro*pous (?), a. Peritropal.

||Per`i*typh*li"tis (?), n. [NL. See Peri-, and Typhlitis.] (Med.) ||Inflammation of the connective tissue about the cÊcum.

Per`i*u"ter*ine (?), a. (Med.) Surrounding the uterus.

Per`i*vas"cu*lar (?), a. Around the blood vessels; as, perivascular lymphatics.

Per`i*ver"te*bral (?), a. (Anat.) Surrounding the vertebrÊ.

Per`i*vis"cer*al (?), a. (Anat.) Around the viscera; as, the perivisceral cavity.

Per`i*vi*tel"line (?), a. [Pref. peri- + vitelline.] (Biol.) Situated around the vitellus, or between the vitellus and zona pellucida of an ovum.