key course
Building and Architecture (now rare )
noun
A course containing a keystone or consisting of keystones.
Origin
Early 18th century.
- treader
- treadle
- treadmill
- tread on air
- tread (or step) on someone's toes
- tread (or walk) the boards
- tread the boards (or stage)
- tread water
- treadwheel
- treas.
- treason
- treasonable
- treasonably
- treasonous
- treasure
- treasure hunt
- treasurer
- treasurership
- Treasure State
- treasure trove
- treasury
- Treasury bench
- Treasury bill
- Treasury bond
- Treasury note