Word Study
zirconoid
CIDE DICTIONARY
zirconoid, n. [Zircon + oid.].
A double eight-sided pyramid, a form common with tetragonal crystals; -- so called because this form often occurs in crystals of zircon. [1913 Webster]
For further exploring for "zirconoid" in Webster Dictionary Online
(NT only) to listen to the NET Bible 
