tropism defined in 1951 yeartropism - tropism;
tropism - (1) Response to stimulus, e.g. gravity or light, in plants and sedentary animals by growth curvature, the direction of curvature being determined by the direction from which the stimulus originates. Compare with: Nastic Movement. (2) (Zool.). Equivalent to taxis but this usage is becoming absolete. truffle. Subterranean fruit-body of Ascomycete fungi belonging to order Tuberales; prized as a gastronomic delicacy. trypanosoma. Genus of flagellate Protozoa, parasitic in the blood of vertebrates, and in the gut of tsetse flies and other insects, which transmit them to vertebrates. Trypanosomes cause important diseases in man (sleeping sickness) and horses and cattle in Africa.
near tropism in Knolik
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