rudiment /rooˈdi-mənt/

1. (usu in pl) a first principle or element
2. Anything in a rude or first state
3. An organ in the first discernible stage
4. Often applied to an organ that never develops beyond an early stage (biology)

rudimental /-mentˈl/ adjective

Rudimentary

rudimenˈtarily adverb

• oarsman
• oarsmanship
• oarsmanships
• oarsmen
• oarswoman
• oarswomen
• oarweed
• oary
• oas
• OAS
• oases
• oasis
• oast
• oast house
• oast houses
• oasts
• oat
• oatcake
• oatcakes
• oaten
• oater
• oaters
• oat grass
• oat grasses
• oath