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.
Gastropodous
(Gas*trop"o*dous) a. (Zoöl.) Of or pertaining to the Gastropoda.
Gastroraphy
(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.
Gastroscope
(Gas"tro*scope) n. [Gastro- + -scope.] (Med.) An instrument for viewing or examining
the interior of the stomach.
Gastroscopic
(Gas`tro*scop"ic) a. Of or pertaining to gastroscopy.
Gastroscopy
(Gas*tros"co*py) n. (Med.) Examination of the abdomen or stomach, as with the gastroscope.
Gastrosplenic
(Gas`tro*splen"ic) n. [Gastro- + splenic.] (Anat.) Pertaining to the stomach and spleen; as,
the gastrosplenic ligament.
Gastrostege
(Gas*tros"tege) n. [Gastro- + Gr. roof.] (Zoöl.) One of the large scales on the belly of a
serpent.
Gastrostomy
(Gas*tros"to*my) n. [Gastro- + Gr. mouth.] (Surg.) The operation of making a permanent
opening into the stomach, for the introduction of food.
Gastrotomy
(Gas*trot"o*my) n. [Gastro + Gr. to cut: cf. F. gastrotomie.] (Surg.) A cutting into, or opening
of, the abdomen or the stomach.
Gastrotricha
(||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.
Gastrotrocha
(||Gas*trot"ro*cha) n. [NL., fr. Gr. stomach + a wheel.] (Zoöl.) A form of annelid larva
having cilia on the ventral side.
Gastrovascular
(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.
Gastrula
(||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.
Gastrulation
(Gas`tru*la"tion) n. (Biol.) The process of invagination, in embryonic development, by
which a gastrula is formed.
Gastrura
(||Gas*tru"ra) n. pl. [NL., fr. Gr. gasth`r belly + o'yra` tail.] (Zoöl.) See Stomatopoda.
Gastrurous
(Gas*tru"rous) a. (Zoöl.) Pertaining to the Gastrura.
Gat
(Gat) imp. of Get. [Obs.]
