Eukaryote

Etymology
Eukaryote:

eu: "proper" (from greek ευ-, meaning "good" or "proper")

karyon: "nut" (from greek καρυόν, meaning "nut" or "kernel")

Explanation
Eukaryotes are organisms which are comprised of cell(s) that contain a proper (eu) nucleus, which is shaped somewhat like a kernel (karyon), as opposed to prokaryotes that do not have a proper nucleus.