protoxylem

/proh-tuh-zahy-luhm, -lem/US // ˌproʊ təˈzaɪ ləm, -lɛm //UK // (ˌprəʊtəˈzaɪləm) //

原生态,原生型,原生代,原生质感

Definitions

n.名词 noun

1
Botany.
- : the part of the primary xylem that develops first, consisting of narrow, thin-walled cells.