noun
xylem; woody parts of a plant
Botanical term for the water-conducting tissue in vascular plants; also used more generally for the woody parts of a plant.
木質部は根から吸い上げた水を葉まで運ぶ。
The xylem transports water absorbed by the roots up to the leaves.
この植物の木質部は非常に硬い。
The woody parts of this plant are very hard.
道管 (vessel) is a component of xylem in angiosperms; 木質部 is the broader tissue.
Compound of 木質 (woody, ligneous) and 部 (part, section). The term is a direct calque from Western botanical terminology.