1. circalittoral - Noun
2. circalittoral - Adjective
circalittoral (uncountable)
The region of the sublittoral zone which extends from the lower limit of the infralittoral to the maximum depth at which photosynthesis is still possible.
circalittoral (comparative more circalittoral, superlative most circalittoral)
Situated in this region of the sublittoral zone.