eukaryote(n = noun.animal) eucaryote - an organism with cells characteristic of all life forms except primitive microorganisms such as bacteria; i.e. an organism with `good' or membrane-bound nuclei in its cells;
an organism with "good" or membrane-bound nuclei having multiple chromosomes; eucaryotes also have other membrane-bound organelles such as mitochondria or chloroplasts, within the cytoplasm enclosed by the outer membrane. Such cells are characteristic of all life forms except primitive microorganisms such as bacteria and blue-green algae. Contrasted with prokaryote. [WordNet 1.5]
eukaryote, n. (also eucaryote) Biol. an organism consisting of a cell or cells in which the genetic material is contained within a distinct nucleus (cf. PROKARYOTE).