Etymology
from the stem of New Latin Trematoda, class name, neuter plural derivative from the stem of Greek trēmatṓdēs "having holes," from trēmat-, trêma "aperture, hole" (from trē-, variant stem of tetraínein "to bore through, perforate" + -mat-, -ma, resultative noun suffix) + -ōdēs "like, having the nature of"; trē- going back to Indo-European *treh1- "bore," apparently variant of *terh1- with the same sense — more at elodea}, {mat
Note: The taxon Trematoda was introduced by the Sweden-born German physician and naturalist Karl Asmund Rudolphi (1771-1832) in Entozoorum, sive vermium intestinalium historia naturalis, volumen 1 (Amsterdam, 1808), p. 198. Rudolphi characterized Trematoda as a subdivision of Entozoa (intestinal worms): "…3. E[ntozoa] trematoda (τρημα, foramen [aperture, hole], τρηματωδης foraminosus [full of holes]) … ." The name seems to allude to the suckers that trematodes use for attachment, which Rudophi called pori suctorii "sucker pores."
First Known Use
circa 1859, in the meaning defined above
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