noun
- the earliest recognizable stage of a developing organ or structure in an embryo or plant
Usage: biology; plural form of primordium
Examples
- The leaf primordia were visible under the microscope as small bumps on the stem.
- During embryonic development, limb primordia appear as tiny buds.
- Botanists studied the flower primordia to understand petal formation.
- The primordia of the nervous system develop very early in vertebrate embryos.
- Researchers identified the molecular signals that control primordia development.
- Each primordium in the primordia will eventually become a fully formed organ.