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From Biology-Online Dictionary | Biology-Online Dictionary
(Science: chemical) a variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, especially. Agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava.
Origin: gr. Almond: cf. F. Amygdaloide.