guard cell

noun

: one of the two crescent-shaped epidermal cells that border and open and close a plant stoma

First Known Use

1875, in the meaning defined above

Time Traveler

The first known use of guard cell was in 1875

See more words from the same year

Style

“Guard cell.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guard%20cell. Accessed 25 Dec. 2024.

Copy Citation

guard cell

noun

: one of two crescent-shaped cells that form the margin of a stoma in the epidermis of a leaf and serve to open and close it

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