American Heritage® Dictionary of the English Language, Fourth Edition
- n. An igneous rock consisting chiefly of pyroxene and nepheline.
Century Dictionary and Cyclopedia
- n. The name given by Rosenbusch to what had previously been generally designated us “nephelin-dolerite.” The difference between this rock and nephelin-basalt is exceedingly slight. See nephelin-basalt.
- n. geology a dark, finely crystalline rock of volcanic origin, being a mixture of nepheline and pyroxene
- n. an igneous rock consisting of nepheline and pyroxene
“The predominant rock types on Shira and Mawenzi are trachybasalts; the later lava flows on Kibo show a gradual change from trachyandesite to nephelinite.”
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