companion cell


Definition of companion cell

: a living nucleated cell that is closely associated in origin, position, and probably function with a cell making up part of a sieve tube of a vascular plant

First Known Use of companion cell

1859, in the meaning defined above

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The first known use of companion cell was in 1859

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Dictionary Entries Near companion cell

companionate marriage

companion cell

companion crop

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Cite this Entry

“Companion cell.” Dictionary, Merriam-Webster, Accessed 27 Nov. 2021.

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