Related formszy·go·mor·phism, zy·go·mor·phy, noun
Examples from the Web for zygomorphic
The flowers are always more or less bilaterally symmetrical (zygomorphic).Elements of Structural and Systematic Botany|Douglas Houghton Campbell
When a flower can be divided by a single plane into two exactly similar parts; then it is said to be zygomorphic.
In Pelargonium the flower is zygomorphic with a spurred posterior sepal and the petals differing in size or shape.