generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See Mollusca. [Written also Gasteropoda.]

The Gastropoda are divided into three subclasses; viz.: (a) The Streptoneura or Dioecia, including the Pectinibranchiata, Rhipidoglossa, Docoglossa, and Heteropoda. (b) The Euthyneura, including the Pulmonata and Opisthobranchia. (c) The Amphineura, including the Polyplacophora and Aplacophora.

(Gas*trop"o*dous) a. (Zoöl.) Of or pertaining to the Gastropoda.

(Gas*tror"a*phy) n. [Gr. stomach + a sewing, fr. to sew: cf. F. gastrorrhaphie.] (Surg.) The operation of sewing up wounds of the abdomen. Quincy.

(Gas"tro*scope) n. [Gastro- + -scope.] (Med.) An instrument for viewing or examining the interior of the stomach.

(Gas`tro*scop"ic) a. Of or pertaining to gastroscopy.

(Gas*tros"co*py) n. (Med.) Examination of the abdomen or stomach, as with the gastroscope.

(Gas`tro*splen"ic) n. [Gastro- + splenic.] (Anat.) Pertaining to the stomach and spleen; as, the gastrosplenic ligament.

(Gas*tros"tege) n. [Gastro- + Gr. roof.] (Zoöl.) One of the large scales on the belly of a serpent.

(Gas*tros"to*my) n. [Gastro- + Gr. mouth.] (Surg.) The operation of making a permanent opening into the stomach, for the introduction of food.

(Gas*trot"o*my) n. [Gastro + Gr. to cut: cf. F. gastrotomie.] (Surg.) A cutting into, or opening of, the abdomen or the stomach.

(||Gas*trot"ri*cha) n. pl., [NL., fr. Gr. belly + hair.] (Zoöl.) A group of small wormlike animals, having cilia on the ventral side. The group is regarded as an ancestral or synthetic one, related to rotifers and annelids.

(||Gas*trot"ro*cha) n. [NL., fr. Gr. stomach + a wheel.] (Zoöl.) A form of annelid larva having cilia on the ventral side.

(Gas`tro*vas"cu*lar) a. [Gastro- + -vascular.] (Zoöl.) Having the structure, or performing the functions, both of digestive and circulatory organs; as, the gastrovascular cavity of cœlenterates.

(||Gas"tru*la) n.; pl. Gastrulæ (#) [NL., dim. fr. Gr. the stomach.] (Biol.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double- walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastræa.a. Of or pertaining to a gastrula.

(Gas`tru*la"tion) n. (Biol.) The process of invagination, in embryonic development, by which a gastrula is formed.

(||Gas*tru"ra) n. pl. [NL., fr. Gr. gasth`r belly + o'yra` tail.] (Zoöl.) See Stomatopoda.

(Gas*tru"rous) a. (Zoöl.) Pertaining to the Gastrura.

(Gat) imp. of Get. [Obs.]

  By PanEris using Melati.

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