S / sŭbăquānĕus
adjective hapax

sŭbăquānĕus

fem. sŭb-ăquānea · neut. sŭb-ăquāneum
that is; belongs under water
that is or belongs under water, sub-aqueous: subterraneum et subaquaneum viventia carent haustu aëris, Tert. Anim. 32.