'Berylloid' definitions:

Definition of 'Berylloid'

From: GCIDE

Berylloid \Ber"yl*loid\, n. [Beryl + -oid.] (Crystallog.) A solid consisting of a double twelve-sided pyramid; -- so called because the planes of this form occur on crystals of beryl. [1913 Webster] Besaile Besaiel