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The Collaborative International Dictionary
Adelaster

Adelaster \Ad*e*las"ter\, n. [Gr. ? not manifest + ? a star.] (Bot.) A provisional name for a plant which has not had its flowers botanically examined, and therefore has not been referred to its proper genus.

Wiktionary
adelaster

n. (context botany English) A provisional name for a plant which has not had its flowers botanically examined, and therefore has not been referred to its proper genus.