1. Of or relating to or having a fenestra 
2. Of or relating to windows

See also: fenestra, window

• instillation
• instillator
• instilling
• instillment
• instilment
• instinct
• instinctive
• instinctive reflex
• instinctively
• instinctual
• instinctually
• institute
• instituter
• institution
• institutional
• institutionalise
• institutionalised
• institutionalize
• institutionalized
• institutionally
• institutor
• instroke
• instruct
• instruction
• instruction book