Mel″a‐phyre (?), n. [F., fr. Gr. μέλασ, -ανοσ, black + porphyre porphyry.] (Min.) Any one of several dark-colored augitic, eruptive rocks allied to basalt.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.