ber·yl (b r  l)n. A transparent to translucent glassy mineral, essentially aluminum beryllium silicate, Be3Al2Si6O18, occurring in hexagonal prisms and constituting the chief source of beryllium. Transparent varieties in white, green, blue, yellow, or pink are valued as gems. [Middle English, from Old French, from Latin b  ryllus, from Greek brullos, from brullion, from Prakrit veruliya, from Pali ve uriya; perhaps akin to Tamil veiru or viar, to whiten, become pale.]ber yl·line (--l n, -l n ) adj. |
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