Emily Dickinson Lexicon
Definition for PER-I-HEX-A-HE'DRAL
PER-I-HEL-ION, or PER-I-HE'LI-UMPER'IL
PER-I-HEX-A-HE'DRAL, a. [Gr. περι, and hexahedral.]
Designating a crystal whose primitive form is a four-sided prism, and in the secondary form is converted into a prism of six sides. – Cleaveland.
Return to page 67 of the letter “P”.