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1. (n.) amygdaloid
a volcanic rock in which rounded cavities formed by the expansion of gas or steam have later become filled with deposits of various minerals.
2. (adj.) amygdaloid
Also, a&syl;mygda&syl;loidal. almond-shaped.
Etymology: (1785–95)
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| Definition of 'amygdaloid' |
Princeton's WordNet |
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1. (adj) amygdaloid
volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
2. (adj) almond-shaped, amygdaliform, amygdaloid, amygdaloidal
shaped like an almond
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| Definition of 'amygdaloid' |
Webster Dictionary |
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1. (adj) amygdaloid
alt. of Amygdaloidal
2. (noun) amygdaloid
a variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava
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Definitions of amygdaloid 
