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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.
References in periodicals archive ?
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).
Woodland species were more restricted and only the Western Pewee, the Berylline Hummingbird and the Hepatic Tanager were seen in Acacia forests.
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.