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[ ′sȯrs ‚räk] (geology) Rock from which fragments have been derived which form a later,...

Dentistry any of various materials used in filling teeth mineral matter, such as silica and...

[ kəm′pō·nənt] (chemistry) A part of a mixture. The smallest number of chemical substances...

[ ¦mak·rō′krist·əl·ən] (petrology) Pertaining to the texture of holocrystalline rock in...

nounA genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white...