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coma

UK/ˈkəʊmə/ US/ˈkoʊmə/ common

noun

1.
2.

a usually terminal tuft of hairs especially on a seed

3.

(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed

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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.