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arine, and usually have a broad, short body, covered with a strong shell or carapace. The abdomen is small and curled up beneath the body.

The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.

Having the head, thorax, and abdomen separated by a deep constriction. Disjunct tetrachords (Mus.), tetrachords so disposed to each other that the gravest note of the upper is one note higher than the acutest note of the other.

ck, of giving a sudden upward spring, by a quick movement of the articulation between the abdomen and thorax; -- called also click beetle, spring beetle, and snapping beetle.

Situated upon or over the colon; -- applied to the region of the abdomen adjacent to the colon.

reas of the carapace of crabs. Epigastric region. (Anat.) (a) The whole upper part of the abdomen. (b) An arbitrary division of the abdomen above the umbilical and between the two hypochondriac regions.

The upper part of the abdomen.

ng a large portion of the abdominal viscera, occasioned by relaxation of the walls of the abdomen.

The operation of cutting into the upper part of the vagina, through the abdomen (without opening the peritoneum), for the purpose of removing a fetus. It is a substitute for the Cæsarean operation, and less dangerous.

The operation of sewing up wounds of the abdomen. Quincy.

Examination of the abdomen or stomach, as with the gastroscope.

A cutting into, or opening of, the abdomen or the stomach.

The line between the lower part of the abdomen and the thigh, or the region of this line; the inguen.

Suicide, by slashing the abdomen, formerly practiced in Japan, and commanded by the government in the cases of disgraced officials; disembowelment; -- also written, but incorrectly, hari-kari. W. E. Griffis.

roduced, by hypochondriasis. Hypochondriac region (Anat.), a region on either side of the abdomen beneath the cartilages of the false ribs, beside the epigastric, and above the lumbar, region.

the hypogastrium or the hypogastric region. Hypogastric region. (a) The lower part of the abdomen. (b) An arbitrary division of the abdomen below the umbilical and between the two iliac regions.

The lower part of the abdomen.

inal obstruction. It is characterized by complete constipation, with griping pains in the abdomen, which is greatly distended, and in the later stages by vomiting of fecal matter. Called also ileac, or iliac, passion.

pper margin of the ilium. -- Iliac passion. See Ileus. -- Iliac region, a region of the abdomen, on either side of the hypogastric regions, and below the lumbar regions.

A division of amphipod Crustacea, in which the abdomen is small or rudimentary and the legs are often reduced to five pairs. The whale louse, or Cyamus, and Caprella are examples.