bipyramid /bī-pirˈə-mid/

A crystal form of two pyramids base to base

• acarology
• acarophilies
• acarophily
• acarpellous
• acarpelous
• acarpous
• acarus
• ACAS
• acatalectic
• acatalectics
• acatalepsies
• acatalepsy
• acataleptic
• acatamathesia
• acatamathesias
• acater
• acaters
• acates
• acathisia
• acatour
• acatours
• acaudal
• acaudate
• acaulescent
• acauline