leech

Leech is a noun with two distinct meanings, or perhaps it is more accurately stated that leech is two separate nouns that are spelled the same and often conflated. The word is the name for a type of blood-sucking invertebrate, and it also is an archaic term for a physician or healer. The two senses are associated because physicians used to (and in some limited applications still do) use the worms to draw blood out of a patient. The conflation of the two goes back to Old English, where læce is the word for both a physician and a bloodsucker, but the two senses apparently come from distinct roots.

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