zoön

from The Century Dictionary.

• noun An animal form containing all the elements of a typical organism of the group to which it belongs; a morphological individual regarded as the whole product of an impregnated ovum, which may or may not be divided into persons or zoöids without true generation. See zoöid.

from the GNU version of the Collaborative International Dictionary of English.

• noun An animal which is the sole product of a single egg; -- opposed to zooid.
• noun Any one of the perfectly developed individuals of a compound animal.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology Alternative spelling of zoon.