The Greek word for leech. Webster 1913 seems to have ignored it. We use it as a root for a few English words, albeit obscure and unloved words.
Bdell- and Bdello-: Prefixes meaning 'leech'.
-bdella: A postfix meaning leech. This shows up in genera names in helminthology.
Bdellatomy: the practice of cutting open the stomach of a sucking leech. If you don't do this the leech will let go when he is full, but cutting a small hole in the leeches stomach guarantees that he will never be full. This was apparently a great advance in the art of bloodletting.
Bdellidae: A family of mites that feed on insects or other mites.
Bdellodrilus: A genus of small leechlike oligochaete worms that live as parasites on the gills of crayfishes.
Bdellodrilus: Like or relating to a leech.
Bdelloid: A leech.
Bdelloida: An order of Rotifera forms that can swim freely and creep like leeches.
Bdellonemertea: An order of Nemertea made of short, thick bodied forms with a large posterior sucker and no eyes or cerebral organ.
Bdellonyssus: A genus of mites that feed on vertebrates.
Bdelloura: A genus of triclad flatworms that live in the gills of horseshoe crabs.
But if you guessed that bdellium belong on this list, you would be wrong. It's a gum resin that comes from trees of the genus Commiphora, and is similar to myrrh. It has nothing to do with leeches; its name is an unfortunate coincidence.