- Any very large ray, especially any species of the genus Manta or Cepholoptera, some of which become more than twenty feet across and weigh several tons. See also Ox ray, under Ox.
- The angler.
- Any large cephalopod, as a large Octopus or a giant squid (Architeuthis). See Devilfish.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sea devil. Retrieved September 20, 2026, from http://smartdefine.org/sea_devil/definitions/2059323 |
| Chicago | Webster's. 2011. "sea devil" http://smartdefine.org/sea_devil/definitions/2059323 (accessed September 20, 2026). |
| Harvard | Webster's 2011, sea devil, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/sea_devil/definitions/2059323>. |
| MLA | Webster's. "sea devil" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/sea_devil/definitions/2059323> |