bilateral symmetry
Noun
Meaning
the property of being symmetrical about a vertical plane
Source: WordNetSynonyms
Hypernyms
Examples
Because they do not have internal body cavities, Platyhelminthes were regarded as a primitive stage in the evolution of bilaterians (animals with bilateral symmetry and hence with distinct front and rear ends).
Due to bilateral symmetry the brain has a hippocampus in each cerebral hemisphere, so every normal brain has two of them.
So the retinoic acid is an endogenous signal that maintains the bilateral synchrony of mesoderm segmentation and controls bilateral symmetry in vertebrates.
At this stage the bilateral symmetry is lost and radial symmetry develops.