The American Heritage® Dictionary of the English Language, 4th Edition
n. A white to dark gray amphibole mineral, Ca2Mg5Si8O22(OH)2, typically occurring in aggregates and used as a substitute for asbestos and in paints and ceramics.
n. A pale grey/green amphibole mineral that is a mixed calcium and magnesium silicate, with the chemical formula Ca2Mg5Si8O22(OH)2; sometimes used in place of asbestos.
the GNU version of the Collaborative International Dictionary of English
n. A white variety of amphibole, or hornblende, occurring in long, bladelike crystals, and coarsely fibrous masses.
The Century Dictionary and Cyclopedia
n. A variety of amphibole, having usually a white to gray color, and occurring in fibrous or columnar crystalline masses.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a white or pale green mineral (calcium magnesium silicate) of the amphibole group used as a form of asbestos
Word Usage
"The group published its findings and documented the appearance of small amounts of tremolite, a type of asbestos fiber, through testing by three separate laboratories."