LATIN DICTIONARYLexicon Latīnum
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“leech” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

leech
A blood-sucker, sanguisuga (Vid: Plin., 8, 10, 10); hirudo (PROP. and figuratively); hirūdo medicinalis (Liv.): leech a leech sucks, hirudo sanguinem exsugit, extrahit (Plaut.); hirudo plena cruoris (Hor., A.P.; that has sucked to the full).
A physician, Vid.

Quick answer

What is the Latin word for leech?
The usual Latin words for “leech” are sanguī̆sūga, hirūdō, extrahō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.