devilfish
Concise Oxford English Dictionary © 2008 Oxford University Press:
devilfish/ˈdɛv(ə)lfɪʃ/
▶noun (pl. same or devilfishes) any of a number of marine creatures perceived as having a sinister appearance, in particular a devil ray, a stonefish, or an octopus or squid.
'devilfish' also found in these Oxford entries:

