1. the earliest recognizable stage of a developing organ or structure in an embryo or plant
Usage: biology; technical

Examples

• The leaf primordium appears as a small bump on the growing tip of the plant stem.
• Scientists studied the limb primordium to understand how arms and legs develop in embryos.
• Each flower primordium will eventually develop into a complete blossom.
• The primordium contains the basic cellular structure that will form the mature organ.
• Researchers can identify the primordium of various body parts in early developmental stages.
• The root primordium emerges from specific regions of the plant’s growing tissue.