n. the chemical formula for cobalt, a ferromagnetic metal of atomic number 27.
Syn. -- cobalt, atomic number 27. [ WordNet 1.5 ]

A form of the prefix com-, signifying with, together, in conjunction, joint. It is used before vowels and some consonants. See Com-. [ 1913 Webster ]

n. the chemical formula for carbon dioxide, a heavy odorless gas (CO2) formed during respiration and by the combustion or decomposition of organic substances; it is absorbed from the air by plants in photosynthesis. The formula itself, pronounced out, is often used instead of the full name, especially with reference to fire extinguishers using this gas for fire suppression; as, a CO2 extinguisher.
Syn. -- carbon dioxide, carbonic acid gas. [ WordNet 1.5 +PJC ]

a device for suppressing fire, consisting of a steel cylinder containing compressed carbon dioxide, which may be released by pressing on a handle. The release of the gas is usually accomplished through a hose attached to a funnel-shaped vent which is directed at the base of the fire, and when released, part of the carbon dioxide is chilled sufficiently to solidify into a powder. The large quantity of inert carbon dioxide released on top of a small fire is usually sufficient to exinguish the flame by excluding oxygen, and the cooling effect also helps drive the temperature of the combustible material below that required to support compustion. It is used in situations where putting water on the fire might cause undesirable damage. [ PJC ]

(Biochem) an abbreviation for coenzyme A. [ PJC ]

a. [ L. coacervatus, p. p. of coacervare to heap up; co- + acervare. See Acervate. ] Raised into a pile; collected into a crowd; heaped. [ R. ] Bacon. [ 1913 Webster ]

v. t. To heap up; to pile. [ R. ] [ 1913 Webster ]

n. [ L. coacervatio. ] A heaping together. [ R. ] Bacon. [ 1913 Webster ]

n. [ F. coche, fr. It. cocchio, dim. of cocca little boat, fr. L. concha mussel, mussel shell, Gr. &unr_;, akin to Skr. çankha. Cf. Conch, Cockboat, Cockle. ] 1. A large, closed, four-wheeled carriage, having doors in the sides, and generally a front and back seat inside, each for two persons, and an elevated outside seat in front for the driver. [ 1913 Webster ]

☞ Coaches have a variety of forms, and differ in respect to the number of persons they can carry. Mail coaches and tallyho coaches often have three or more seats inside, each for two or three persons, and seats outside, sometimes for twelve or more. [ 1913 Webster ]

2. A special tutor who assists in preparing a student for examination. [ Colloq. ] [ 1913 Webster ]

Wareham was studying for India with a Wancester coach. G. Eliot. [ 1913 Webster ]

3. (Naut.) A cabin on the after part of the quarter-deck, usually occupied by the captain. [ Written also couch. ] [ Obs. ] [ 1913 Webster ]

The commanders came on board and the council sat in the coach. Pepys. [ 1913 Webster ]

4. (Railroad) A first-class passenger car, as distinguished from a drawing-room car, sleeping car, etc. It is sometimes loosely applied to any passenger car. [ 1913 Webster ]

5. One who coaches; specif. (sports), a trainer; one who assists in training individual athletes or the members of a sports team, or who performs other ancillary functions in sports; as, a third base coach. [ +PJC ]

v. t. [ imp. & p. p. Coached p. pr. & vb. n. Coaching. ] 1. To convey in a coach. Pope. [ 1913 Webster ]

2. To prepare for public examination by private instruction; to train by special instruction. [ Colloq. ] [ 1913 Webster ]

I coached him before he got his scholarship. G. Eliot. [ 1913 Webster ]