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phototonus

(fō tät′ə nəs)

noun

Biol. the state of being responsive to or irritated by exposure to light

Origin: ModL: see photo- & tone

Related Forms:

phototonic adjective

See phototonus in American Heritage Dictionary 4

noun

The state of being sensitive to or irritated by light.

Related Forms:

phoˌto·tonˈic (fōˌtə-tŏnˈĭk) adjective

Learn more about phototonus

phototonus medical definition

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