amenorrhoea or (esp N American) amenorrhea /a- or ā-men-ə-rēˈə/

Failure or absence of menstruation

• night safe
• night safes
• night school
• night schools
• night-season
• night-seasons
• nightshade
• nightshades
• night shift
• night shifts
• nightshirt
• nightshirts
• night-shriek
• night-shrieks
• nightside
• nightsides
• perpetuation
• perpetuations
• perpetuator
• perpetuators
• perpetuities
• perpetuity
• perpetuum mobile
• perplex
• perplexed