guard cell

n. One of the paired epidermal cells that control the opening and closing of a stoma in plant tissue.

guard cell

n (Botany) botany one of a pair of crescent-shaped cells that surround a pore (stoma) in the epidermis. Changes in the turgidity of the cells cause the opening and closing of the stoma

guard′ cell`

n. either of a pair of crescent-shaped cells that flank each plant pore and control its opening and closing by means of turgidity.

guard cell

(gärd) One of the paired cells that control the opening and closing of a stoma of a leaf. When swollen with water, guard cells pull apart from each other, opening the stoma to allow the escape of water vapor and the exchange of gases. When drier, guard cells move closer together, allowing the plant to conserve water. See more at cell.

guaranine

caf·feine

(kaf'ēn), Although this word was originally pronounced in three syllables, modern usage has fused the second and third syllables into one. Avoid the mispronunciation kaf-ēn'.An alkaloid obtained from the dried leaves of Thea sinensis, tea, or the dried seeds of Coffea arabica, coffee; used as a central nervous system stimulant, diuretic, circulatory and respiratory stimulant. Synonym(s): guaranine, thein

单词	guard cell
释义	guard cell guard cell n. One of the paired epidermal cells that control the opening and closing of a stoma in plant tissue. guard cell n (Botany) botany one of a pair of crescent-shaped cells that surround a pore (stoma) in the epidermis. Changes in the turgidity of the cells cause the opening and closing of the stoma guard′ cell` n. either of a pair of crescent-shaped cells that flank each plant pore and control its opening and closing by means of turgidity. guard cell (gärd) One of the paired cells that control the opening and closing of a stoma of a leaf. When swollen with water, guard cells pull apart from each other, opening the stoma to allow the escape of water vapor and the exchange of gases. When drier, guard cells move closer together, allowing the plant to conserve water. See more at cell. guard cell guard cell [′gärd ‚sel] (botany) Either of two specialized cells surrounding each stoma in the epidermis of plants; functions in regulating stoma size. guaranine caf·feine (kaf'ēn), Although this word was originally pronounced in three syllables, modern usage has fused the second and third syllables into one. Avoid the mispronunciation kaf-ēn'.An alkaloid obtained from the dried leaves of Thea sinensis, tea, or the dried seeds of Coffea arabica, coffee; used as a central nervous system stimulant, diuretic, circulatory and respiratory stimulant. Synonym(s): guaranine, thein ThesaurusSeestoma
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