abyssolith

abyssolith

[ə′bis·ō‚lith]
(geology)
A molten mass of eruptive material passing up without a break from the zone of permanently molten rock within the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Because it cannot be plumbed, every batholith is also an abyssolith. The first word's long vowels and whispery consonants bring the ocean to my ear.
Souvenirs of Stone
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