the primary rib or mid-vein of a leaf or leaflet

listen to the pronunciation of the primary rib or mid-vein of a leaf or leaflet
Английский Язык - Английский Язык

Определение the primary rib or mid-vein of a leaf or leaflet в Английский Язык Английский Язык словарь

The primary rib or mid-vein of a leaf or leaflet
midrib