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coaxial cable
Cob coal
Cob loaf
Cob money
cobalt 60
cobalt bloom
cobalt blue
cobalt chloride
Cobalt crust
Cobalt glance
Cobalt green
cobalt ultramarine
Cobalt yellow

Cobalt definitions

Webster's 1828 Dictionary

COBALT, n. A mineral of a reddish gray or grayish white color, very brittle, of a fine close grain, compact, but easily reducible to powder. It crystalizes in bundles of needles, arranged one over another. It is never found in a pure state; but usually as an oxyd, or combined with arsenic or its acid, with sulphur, iron, etc. Its ores are arranged under the following species, viz. Arsenical cobalt, of a white color, passing to steel gray; its texture is granular, and when heated it exhales the odor of garlic: gray cobalt, a compound of cobalt, arsenic, iron, and sulphur, of a white color, with a tinge of red; its structure is foliated, and its crystals have a cube for their primitive form; sulphuret of cobalt, compact and massive in its structure: oxyd of cobalt, brown or brownish black, generally friable and earthy: sulphate and arseniate of cobalt, both of red color, the former soluble in water. The impure oxyd of cobalt is called zaffer; but when fused with three parts of siliceous sand and an alkaline flux, it is converted into a blue glass, called smalt. The great use of cobalt is to give a permanent blue color to glass and enamels upon metals, porcelain and earthern wares.
Cobalt-bloom, acicular arseniate of cobalt.
Cobalt-crust, earthy arseniate of cobalt.

WordNet (r) 3.0 (2005)

1: a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition [syn: cobalt, Co, atomic number 27]

Merriam Webster's

noun Etymology: German Kobalt, alteration of Kobold, literally, goblin, from Middle High German kobolt; from its occurrence in silver ore, believed to be due to goblins Date: 1683 1. a tough lustrous silver-white magnetic metallic element that is related to and occurs with iron and nickel and is used especially in alloys see element table 2. cobalt blue 2

Dictionary of the Elements

Symbol: Co
Atomic number: 27
Atomic weight: 58.993
Light grey transition element. Some meteorites contain small amounts of metallic cobalt. Generally alloyed for use. Mammals require small amounts of cobalt salts. Cobalt-60, an artificially produced radioactive isotope of Cobalt is an important radioactive tracer and cancer-treatment agent. Discovered by G. Brandt in 1737.

Oxford Reference Dictionary

n. Chem. a silvery-white magnetic metallic element occurring naturally as a mineral in combination with sulphur and arsenic, and used in many alloys. Usage: Symb.: Co. Phrases and idioms: cobalt blue 1 a pigment containing a cobalt salt. 2 the deep-blue colour of this. Derivatives: cobaltic adj. cobaltous adj. Etymology: G Kobalt etc., prob. = KOBOLD in mines

Webster's 1913 Dictionary

Cobalt Co"balt (k[=o]"b[o^]lt; 277, 74), n. [G. kobalt, prob. fr. kobold, kobel, goblin, MHG. kobolt; perh. akin to G. koben pigsty, hut, AS. cofa room, cofgodas household gods, Icel. kofi hut. If so, the ending -old stands for older -walt, -wald, being the same as -ald in E. herald and the word would mean ruler or governor in a house, house spirit, the metal being so called by miners, because it was poisonous and troublesome. Cf. Kobold, Cove, Goblin.] 1. (Chem.) A tough, lustrous, reddish white metal of the iron group, not easily fusible, and somewhat magnetic. Atomic weight 59.1. Symbol Co. Note: It occurs in nature in combination with arsenic, sulphur, and oxygen, and is obtained from its ores, smaltite, cobaltite, asbolite, etc. Its oxide colors glass or any flux, as borax, a fine blue, and is used in the manufacture of smalt. It is frequently associated with nickel, and both are characteristic ingredients of meteoric iron. 2. A commercial name of a crude arsenic used as fly poison. Cobalt bloom. Same as Erythrite. Cobalt blue, a dark blue pigment consisting of some salt of cobalt, as the phosphate, ignited with alumina; -- called also cobalt ultramarine, and Thenard's blue. Cobalt crust, earthy arseniate of cobalt. Cobalt glance. (Min.) See Cobaltite. Cobalt green, a pigment consisting essentially of the oxides of cobalt and zinc; -- called also Rinman's green. Cobalt yellow (Chem.), a yellow crystalline powder, regarded as a double nitrite of cobalt and potassium.

Collin's Cobuild Dictionary

1. Cobalt is a hard silvery-white metal which is used to harden steel and for producing a blue dye. ...a country rich in copper, cobalt and diamonds. 2. Cobalt or cobalt blue is a deep blue colour. ...a woman in a soft cobalt blue dress. COLOUR

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