sieve tube Word Origin noun Botany.
- 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 British Dictionary definitions for sieve tube sieve tube noun
- 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