rational horizon
Astronomy (now rare )
noun
A great circle of the celestial sphere that is parallel to the horizon and whose centre is the centre of the earth.
Origin
Late 16th century; earliest use found in Thomas Hill (b. c1528).
- Red Indian fish
- redingote
- redingtonite
- red ink
- red-ink plant
- redintegrate
- redintegration
- redintegrative
- red in tooth and claw
- redip
- redirect
- redirection
- red iron
- red ironbark
- red iron ore
- red ironstone
- red ironwood
- redisburse
- redisbursement
- redischarge
- rediscount
- rediscountable
- rediscount rate
- rediscover
- rediscovery