G2785
κῆτος
sea monster
κῆτος, -εος (-ους), τό [in LXX: Jon.2.1; Jon.2.10 (דָּג) Gen.1:21 (תַּנִּין), etc. ;] a huge fish, sea-monster: Mat.12:40 (LXX).† (AS)
The KJV translates G2785 in the following manner:
whale’s (2x)
Full Thayer's lexicon entry
κῆτος — kētos
κῆτος, κητεος (κήτους), τό, a sea-monster, whale, huge fish (Homer, Aristotle, others): Mat 12:40, from Jon 2:1 where the Sept., κήτει μεγάλῳ for גָּדול דַּג.
1 occurrence