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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 bēryllus, from Greek bērullos, from bērullion, from Prakrit veruliya, from Pali veḷuriya; perhaps akin to Tamil veḷiru or viḷar, to whiten, become pale.]

ber′yl·line (-ə-lĭn, -līn′) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Beginning with Allen's Hummingbird, an alphabetical listing of the birds extant in North America is presented, including Anna's, Berylline, Black-chinned, Buff Bellied, Calliope and Costa's, and on through Lucifer, Magnificent (Rivoli), Ruby-throated, Rufous, Violet Crowned, and finally White-eared.
Finally, the Western Pewee Contopus sordidulus, the Berylline Hummingbird Amazilia berillyna, the Solitary Vireo Vireo solitarius, the Hepatic Tanager Piranga flava, the Black-throated Grey Warbler Dendroica nigrescens, the Gray-breasted Jay Aphelocoma ultramarina and the Ruby-crowned Kinglet Regulus calendula which were mixed and oak woodland birds (Table 3).
Among them are the white-eared (Hylocharis leucotis), which bears a heavy white eye stripe and red bill, and the berylline (Amazilia berylline), which is dominantly green.