Definitions

1. noun

A condition in which a structure or organism lacks symmetry, particularly in the arrangement of parts or in the development of organs.

“The development of the embryo in the absence of a notochord is an example of ametria.”

2. biology

A term used in embryology to describe the lack of bilateral symmetry in an embryo.

“The researcher noted that the early stages of the embryo exhibited ametria before developing into a bilaterally symmetrical organism.”