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Sierra
sierra
Sierra Leone
Sierra Madre
Sierra Nevada
Sierra Vista
siesta
sieve
sieve cell
sieve element
sieve plate
sieve tube
sieve tube element
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sieve cell
sieve cell (plural sieve cells)


noun 
Definition:
 
cell with pores in walls: a cell in the sieve tubes of some plants, occurring in rows with groups of pores through which sap is transported
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