phototonus

Noun

pho=tot=o=nus

CIDE DICTIONARY

phototonus, n. [NL. See Photo-, and Tone.].

A motile condition in plants resulting from exposure to light. [1913 Webster]
An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light. [Webster 1913 Suppl.]

For further exploring for "phototonus" in Webster Dictionary Online

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phrase	search for verses that contains all of the search phrase.	"fish bread" will search for verses that contains "fish bread" in minimum 1 bible version
at least one	search for verses that contains any of the search words.	"fish bread" will search for verses that contains fish OR bread in minumum 1 bible version
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