n.
Pronunciation: ' am(p)-f ə - ˌ b ō l
Function: noun
Etymology: French, from Late Latin amphibolus, from Greek amphibolos ambiguous, from amphiballein to throw round, doubt, from amphi- + ballein to throw ― more at DEVIL
Date: circa 1823
1 : HORNBLENDE
2 : any of a group of complex silicate minerals with like crystal structures that contain calcium, sodium, magnesium, aluminum, or iron ions or a combination of them