Dated Plural Form for Eight-Armed Sea Creatures

This page is the CodyCross answer for the clue below from Amusement Park, Group 212, Puzzle 5 (Swinging Inverter Ship).

Question is: Dated Plural Form for Eight-Armed Sea Creatures

and the answer is: OCTOPI

Word Meaning:

OCTOPI — (nonstandard, hypercorrect) plural of octopus

Definitions from Wiktionary.