Antimere

noun

1. A part or division in the body of a bilaterally or radially symmetric animal that corresponds to an opposite or similar part.
2. In biology, a segment or division of the body in the direction of one of the secondary or transverse axes, all of which are at right angles to the primary or longitudinal axis.
3. One of the two halves of bilaterally symmetrical animals; one of any opposite symmetrical or homotypic parts in animals and plants.
4. One of the two halves of bilaterally symmetrical animals; one of any opposite symmetrical or homotypic parts in animals and plants.