Etymology
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coma (n.1)

"state of prolonged unconsciousness," 1640s, from Latinized form of Greek kōma (genitive kōmatos) "deep sleep," which is of uncertain origin. A term for "coma" in Middle English was false sleep (late 14c.). Related: Comal.

coma (n.2)

"nebulous, hair-like envelope surrounding the head of a comet," 1765, from Latin coma, from Greek komē "hair of the head," which is of unknown origin. Earlier in English as a botanical term for a tuft of hairs (1660s). For the constellation Coma Berenices, see Berenice. Related: Comal.

updated on November 17, 2018

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Definitions of coma from WordNet

coma (n.)
a state of deep and often prolonged unconsciousness; usually the result of disease or injury;
Synonyms: comatoseness
coma (n.)
(botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds);
coma (n.)
(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed;
From wordnet.princeton.edu, not affiliated with etymonline.