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‖ ˈDistoma, ˈDistomum Zool.
[mod.L., Gaertner 1775, f. Gr. δίστοµος, -ον double-mouthed, f. δι- twice + στόµα, pl. στόµατα mouth. The form distoma has pl. diˈstomata; distomum, pl. distoma.
The etymological form is Distomum repr. Gr. δίστοµον; Distoma as a neuter, with pl. Distomata is absurd, such a form as δίστοµα, -όµατα, being impossible in Gr. But Distoma as a fem. of modern formation, would be admissible.]
A genus of digenetic Trematoda, parasitic worms or flukes, having two suckers (whence the name), of which numerous species infest the alimentary canal, liver, etc., of vertebrates, the best-known being the liver-fluke (D. hepaticum) which causes rot in sheep. It is the typical genus of the family Distomidæ.
1851–60Mayne Expos. Lex., Distoma., Zool., name of a genus of the Entozoa Trematodea, in which there is a sucker at the anterior extremity of the mouth, and a cup a little posterior to it on the venter. 1871T. R. Jones Anim. Kingd. (ed. 4) 158 The now tailless animal assumes the appearance of a Distoma or fluke. 1876tr. Wagner's Gen. Pathol. 120 The young..in the distomata go through a complicated alternate generation connected with metamorphosis. 1884Public Opinion 12 Sept. 331/1 Death caused by..distoma. 1888Rolleston & Jackson Anim. Life 643 On the oral extremity of some species of Distomum.
attrib.1885W. Roberts Urinary & Renal Dis. iii. xiii. (ed. 4) 650 We no longer doubt that the symptoms were produced by distoma-processes.
Hence diˈstomian, a member of the family Distomidæ, or group Distomea.
1876Beneden's Anim. Parasites 45 Worms which have less freedom, like the Distomians, are sometimes both mess⁓mates and parasites. |