- a vertical series of sieve cells in the phloem, specialized for the conduction of food materials.
- a single sieve cell.
Origin of sieve tube
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- botany an element of phloem tissue consisting of a longitudinal row of thin-walled elongated cells with perforations in their connecting walls through which food materials pass