protostele
/proh-tuh-steel, -stee-lee/US // ˈproʊ təˌstil, -ˌsti li //UK // (ˈprəʊtəˌstiːl, -ˌstiːlɪ) //
原子星,原子体,原子能,原生代
Definitions
n.名词 noun
- 1
Botany.
- : the solid stele of most roots, having a central core of xylem enclosed by phloem.
Examples
In its simplest form (as in fig. 36) it is called a protostele, and is to be found in both living and fossil plants.
In the Coal Measure period, however, the protostele was characteristic of one of the two main groups of ferns.
Level 3Browse all words →