1. Having three sides
   - trilateral, triangular

See also: many-sided, multilateral

• butterbean
• butterbur
• buttercrunch
• buttercup
• buttercup family
• buttercup squash
• butterfat
• Butterfield
• butterfingered
• butterfingers
• butterfish
• butterflower
• butterfly
• butterfly bush
• butterfly collector
• butterfly effect
• butterfly flower
• butterfly nut
• butterfly orchid
• butterfly orchis
• butterfly pea
• butterfly plant
• butterfly ray
• butterfly stroke
• butterfly valve