bipyramid /bī-pirˈə-mid/

A crystal form of two pyramids base to base

• eleven-pluses
• eleven-plus examination
• elevens
• elevenses
• eleventh
• eleventh hour
• eleventh-hour
• eleventh hours
• eleventhly
• elevenths
• elevon
• elevons
• elf
• ELF
• elf-arrow
• elf-arrows
• elf-bolt
• elf-child
• elf-children
• elf cup
• elf cups
• elfed
• elfhood
• elfhoods
• elfin