noun
primary root; main root
Botanical term for the first root that develops from a seed, forming the central axis of the root system.
一次根は種子から最初に伸びる根です。
The primary root is the first root that grows from the seed.
多くの植物では、一次根が主根となります。
In many plants, the primary root becomes the taproot.
Taproot; often the same as the primary root in many plants, but 主根 emphasizes the main root of a mature plant.
Compound of 一次 (いちじ, 'primary, first') and 根 (こん, 'root'). A straightforward technical term in botany.