zoonite

from The Century Dictionary.

• noun One of the rings, segments, or somites of which the body of a worm, crustacean, insect, vertebrate, or other segmented or articulated animal is composed; a zonule; a metamere or an arthromere of an articulated invertebrate; a diarthromere of a vertebrate: used generically of any segment, to which special names are given in special cases.
• noun Same as zoöid: a mistaken use of the word.

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

• noun One of the segments of the body of an articulate animal.
• noun One of the theoretic transverse divisions of any segmented animal.

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

• noun zoology One of the segments of the body of an articulate animal.
• noun zoology One of the theoretic transverse divisions of any segmented animal.