1. A woman who is unknown or in disguise

Derived forms: incognitas

• billowy
• billy
• billy buttons
• billy club
• billy goat
• Billy Graham
• Billy Mitchell
• Billy Sunday
• Billy Wilder
• billy-ho
• billycan
• billyo
• billyoh
• billystick
• bilobate
• bilobated
• bilobed
• bilocation
• bilocular
• bilocular capsule
• biloculate
• Biloxi
• bilsted
• biltong
• bimanual