Etymology
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magma (n.)

mid-15c., "dregs, any crude mixture of organic matter," from Latin magma "dregs of an ointment," from Greek magma "thick unguent, ointment," from root of massein "to knead, mold," from PIE root *mag- "to knead, fashion, fit." Geological meaning "molten or semi-molten rock" is by 1859. Related: Magmatic.

updated on October 30, 2018

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Definitions of magma from WordNet

magma (n.)
molten rock in the earth's crust;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.