- sieve tube
- nountube formed by cells joined end-to-end through which nutrients flow in flowering plants and brown algae• Hypernyms: ↑vascular tissue
* * *noun: a tube consisting of an end to end series of thin-walled living cells characteristic of the phloem, having no nucleus when mature, and believed to function chiefly in translocation of organic solutes — compare companion cell, sieve cell, sieve plate
* * *Bot.1. a vertical series of sieve cells in the phloem, specialized for the conduction of food materials.2. a single sieve cell.[1870-75]
* * *sieve tube noun (botany)A conducting element in phloem, consisting of thin-walled cells connected end to end with sieve plates between adjacent members• • •Main Entry: ↑sieve
* * *sieve tube,Botany.1. a tubelike structure composed of thin, elongated cells connected through perforations in their end walls, forming the essential element of the phloem of higher vascular plants: »
The thin-walled sieve tubes are often filled with colloidal material and have the appearance of containing live protoplasm (Fred W. Emerson).2. one of the cells that make up this structure; sieve cell.
* * *n. Botany a series of sieve tube elements placed end to end to form a continuous tube
Useful english dictionary. 2012.