1. the outer integument of an ovule in seed plants
Usage: botanical

Examples

• The primine forms the outer layer of the ovule’s protective covering.
• During seed development, the primine contributes to the formation of the seed coat.
• Botanists study the primine to understand ovule structure in flowering plants.
• The primine and secundine together make up the integuments of the ovule.
• In some plant species, the primine is thicker than the inner integument.