• WordNet 3.6
    • n Hirudinea hermaphroditic aquatic or terrestrial or parasitic annelids
    • ***
Webster's Revised Unabridged Dictionary
    • n. pl Hirudinea (Zoöl) An order of Annelida, including the leeches; -- called also Hirudinei.
    • ***
Century Dictionary and Cyclopedia
    • hirudinea An order of annelids having a sucking-disk at one or both ends; the leeches or suctorial annelids. They are hermaphrodite and ametabolous, mostly aquatic and found in fresh water, but sometimes marine or terrestrial, with only superficial annulation, and not chætiferous. There are several families, as Acanthobdellidæ, Malacobdellidæ, Branchiobdellidæ, Gnathobdellidæ. The group is also called Hirudina, Hirudineæ, Hirudinei, as well as Discophora, Suctoria, and Bdelloidea. The Hirudinea are sometimes raised to the rank of a class, ranged with Cestoidea, Trematoidea, and the turbellarians under a phylum Platyhelmia, and divided into two orders, Rhynchobdella and Gnathobdella.
    • ***


Webster's Revised Unabridged Dictionary
NL., fr. L. hirudo, hirudinis, a leech


In literature:

Especially are these to be seen in the more modified Oligochaeta and in the much more modified Hirudinea.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various