Go to 'thermo-' entry Go to 'dino-' entry Go to 'chondro-' entry Go to 'aero-' entry Go to '-logy' entry Go to 'thaumato-' entry Go to 'nano-' entry Go to '-sophy' entry Go to 'bucco-' entry Go to '-ism' entry Go to '-lysis' entry Go to 'galacto-' entry Go to '-anthropy' entry Go to 'pneumo-' entry Go to '-ploitation' entry Go to '-lithic' entry Go to '-sepalous' entry Go to 'onco-' entry Go to '-parous' entry Go to 'dermato-' entry Go to 'multi-' entry Go to 'dodeca-' entry Go to '-zoon' entry Go to 'vermi-' entry Go to 'crystallo-' entry Go to 'biblio-' entry Go to 'eco-' entry Go to 'juxta-' entry Go to 'facio-' entry
Affixes: the building blocks of English
Affixes: the building blocks of English

-tropic Also -tropous.

Turning; changing; affecting.

[Greek tropē, turn, turning.]

Adjectives in both these endings are closely related to nouns in -tropism and -tropy in their various senses. Examples include isotropic (Greek isos, equal), having a physical property which has the same value when measured in different directions; thixotropic (Greek thixis, touching), of a substance that becomes less viscous when subjected to an applied stress; psychotropic (Greek psukhē, breath, soul, mind), denoting drugs that affect a person's mental state.

Adjectives in -tropous have a similar sense, but are much less common; two examples are orthotropous (Greek orthos, straight, right), of an ovule, part of the ovary of the plant, that is growing straight; campylotropous (Greek kampulos, bent), having an ovule that is partially inverted and curved.

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