bipyramid /bī-pirˈə-mid/

A crystal form of two pyramids base to base

• down south
• downspout
• downspouts
• Down's syndrome
• downstage
• downstair
• downstairs
• downstate
• downstates
• downstream
• downstroke
• downstrokes
• downswing
• downswings
• down the drain
• down the hatch
• down the line
• down-the-line
• down the road
• declasses
• declassification
• declassified
• declassifies
• declassify
• declassifying