Cell With at Least One Definite Nucleus
Puzzle 3 of Animals with Weird Names Hard Pack
Question is: Cell With at Least One Definite Nucleus
and the answer is: EUKARYON
Word Meaning:
EUKARYON — A cell containing at least one distinct nucleus - characteristic of the single-celled or multicellular organisms of the taxonomic domain Eukaryota.
Definitions from Wiktionary.