1. Gradually decreasing until little remains
   - dwindling, tapering

See also: decreasing

• oilcan
• oilcloth
• oiled
• oiler
• oilfield
• oilfish
• oiliness
• oilman
• oilpaper
• oilrig
• oilseed
• oilseed rape
• oilskin
• oilstone
• oilstove
• oily
• oink
• ointment
• Oireachtas
• OIS
• Ojibwa
• Ojibway
• Ojos del Salado
• ok
• oka