Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A state of deep, often prolonged unconsciousness, usually the result of injury, disease, or poison, in which an individual is incapable of sensing or responding to external stimuli and internal needs.
  • n. Astronomy The nebulous luminescent cloud containing the nucleus and constituting the major portion of the head of a comet.
  • n. Botany A usually terminal tuft or cluster, especially a tuft of hairs on a seed, as on a willow or milkseed.
  • n. Physics A diffuse, comet-shaped image of a point source of light or radiation caused by aberration in the optical system.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A state of sleep from which one may not wake up, usually induced by some form of trauma.
  • n. A cloud of dust surrounding the nucleus of a comet
  • n. A defect characterized by diffuse, pear-shaped images that should be points
  • n. A tuft or bunch, such as the assemblage of branches forming the head of a tree, a cluster of bracts when empty and terminating the inflorescence of a plant, or a tuft of long hairs on certain seeds.

from the GNU version of the Collaborative International Dictionary of English

  • n. A state of profound insensibility from which it is difficult or impossible to rouse a person. See carus.
  • n. The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet.
  • n. A tuft or bunch, -- as the assemblage of branches forming the head of a tree; or a cluster of bracts when empty and terminating the inflorescence of a plant; or a tuft of long hairs on certain seeds.

from The Century Dictionary and Cyclopedia

  • n. In pathology, a state of prolonged unconsciousness some what resembling sleep, from which the patient cannot be aroused, or can be aroused only partially, temporarily, and with difficulty; stupor.
  • n. In botany: The leafy head of a tree, or a cluster of leaves terminating a stem, as the leafy top of a pineapple.
  • n. The silky hairs at the end of some seeds, as of the willow-herb, Epilobium.
  • n. In astronomy, the nebulous hair-like envelop surrounding the nucleus of a comet.
  • n. In microscopy, the hazy fringe on the outline of a microscopic object seen when the lens is not free from spherical aberration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a state of deep and often prolonged unconsciousness; usually the result of disease or injury
  • n. (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)
  • n. (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed

Etymologies

Greek kōma, deep sleep.
Latin, hair, from Greek komē.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κῶμα (kōma, "deep sleep"). (Wiktionary)
From Latin coma ("hair of the head"), from Ancient Greek κόμη (komē, "hair"). (Wiktionary)

Examples

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.