Emily Dickinson Lexicon

A-MYG'DA-LOID, n. [Gr. αμυγδαλεα, an almond, and ειδος, form; G. mandel-stein, almond-stone.]

Toad-stone; a compound rock, consisting of a basis of basalt, greenstone, or some other variety of trap, imbedding nodules of various minerals, particularly calcarious spar, quartz, agate, zeolite, chlorite, &c. When the imbedded minerals are detached, it is porous, like lava. Cleaveland.