Coma : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: Coma	by the DICT Development Group
2 results for Coma
From WordNet (r) 3.0 (2006) [wn]:
coma n a state of deep and often prolonged unconsciousness; usually the result of disease or injury Synonym(s): coma, comatoseness (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds) (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Envelope \En"velope\ (?; 277), Envelop \Envel"op\ (?; 277), n. [F. enveloppe.] 1. That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter. 2. (Astron.) The nebulous covering of the head or nucleus of a comet; -- called also {coma}. 3. (Fort.) A work of earth, in the form of a single parapet or of a small rampart. It is sometimes raised in the ditch and sometimes beyond it. --Wilhelm. 4. (Geom.) A curve or surface which is tangent to each member of a system of curves or surfaces, the form and position of the members of the system being allowed to vary according to some continuous law. Thus, any curve is the envelope of its tangents.