Word Study
cipro |
ciprofloxacin |
cira |
circ |
circa |
circadian
| circadian rhythm
| circaea
| circaea alpina
| circaea lutetiana
| circaetus
circadian
WORDNET DICTIONARY
Adjective circadian has 1 sense
OXFORD DICTIONARY
circadian, adj. Physiol. occurring or recurring about once per day.
Etymology
irreg. f. L circa about + dies day
For further exploring for "circadian" in Webster Dictionary Online