positive tropism

См. также в других словарях:

• positive tropism — См. positive taxis …   Dictionary of invertebrate zoology

• positive — [päz′ə tiv] adj. [ME positif < OFr < L positivus < positus: see POSITION] 1. formally or arbitrarily set; conventional; artificial [a positive law] 2. definitely set; explicitly laid down; admitting of no question or modification;… …   English World dictionary

• positive — positiveness, n. /poz i tiv/, adj. 1. explicitly stated, stipulated, or expressed: a positive acceptance of the agreement. 2. admitting of no question: positive proof. 3. stated; express; emphatic: a positive denial. 4. confident in opinion or… …   Universalium

• positive — pos•i•tive [[t]ˈpɒz ɪ tɪv[/t]] adj. 1) confident in opinion or assertion; sure: He is positive that he ll win[/ex] 2) cvb showing or expressing approval or agreement; favorable: a positive reaction to the speech[/ex] 3) cv gram. expressing or… …   From formal English to slang

• tropism — n. [Gr. tropos, turn] A movement, orientation or locomotion of a motile organism in response to a stimulus. a. Positive tropism: toward the stimulus. b. Negative tropism: away from the stimulus; see taxis …   Dictionary of invertebrate zoology

• positive — /ˈpɒzətɪv / (say pozuhtiv) adjective 1. explicitly laid down or expressed: a positive declaration. 2. arbitrarily laid down; determined by enactment or convention (opposed to natural): positive law. 3. admitting of no question: positive proof. 4 …  

• tropism — [trō′piz΄əm] n. [< TROPISM] the positive, or negative, attraction of a plant or sessile animal toward, or away from, a stimulus, as in the turning of a sunflower toward the light tropistic adj …   English World dictionary

• Tropism — A tropism (from Greek, tropos , to turn) is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the… …   Wikipedia

• tropism — noun Etymology: International Scientific Vocabulary tropism Date: 1899 1. a. involuntary orientation by an organism or one of its parts that involves turning or curving by movement or by differential growth and is a positive or negative response… …   New Collegiate Dictionary

• tropism — The phenomenon, observed in living organisms, of moving toward (positive t.) or away from (negative t.) a focus of light, heat, or other stimulus; usually applied to the movement of a portion of the organism as opposed to taxis, the …   Medical dictionary

• tropism — n. orientation of an organism usually involving growing in positive or negative response to stimuli (Biology) …   English contemporary dictionary