amphibole Hear it!

amphibole definition

amphi·bole (am′fə bōl′)

noun

any of a group of rock-forming minerals, as hornblende or actinolite, composed largely of silica, calcium, iron, and magnesium: they are common constituents of igneous and metamorphic rocks

Etymology: Fr < LL amphibolus, ambiguous < Gr amphibolos < amphiballein, to throw around, doubt < amphi-, amphi- + ballein, to throw: see ball

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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