applied to the zone of the ocean below the median zone: see quot.
Π
1859 D. PageHandbk. Geol. Terms 381 In the British seas, naturalists (following the late Edward Forbes)..distinguish five belts of depth—viz. 1, the Littoral; 2, Circum-littoral; 3, Median; 4, Infra-median; and 5, the Abyssal or Deep-sea zone.