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the world > life > biology > biological processes > stimulation > [noun] > stimulus (5)
stimulus1793

Physiology. Something that excites an organ or tissue to a specific activity or function; a material agency that produces a reaction in an organism.

irritant1802

An irritant substance, body, or agency; in Pathology a poison, etc. which produces irritation; in Physiology and Biology anything that stimulates…

stimulant1880

Something that excites an organ to its functional activity. (Cf. A. 2b) rare.

cue1931

figurative. A stimulus or signal to perception, articulation, or other physiological response.

zeitgeber1958

An agent or rhythmically occurring event, esp. an environmental influence, which acts as a cue in the regulation of an organism's circadian rhythms.

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