- demersal
[demersal 词源字典]
- "(Chiefly of fish) living close to the floor of the sea or a lake", Late 19th century: from Latin demersus (past participle of demergere 'submerge, sink', from de- 'down' + mergere 'plunge') + -al.[demersal etymology, demersal origin, 英语词源]