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*trep-

Proto-Indo-European root meaning "to turn."

It forms all or part of: apotropaic; atropine; Atropos; contrive; entropy; heliotrope; isotropic; psychotropic; retrieve; trope; -trope; trophy; tropic; tropical; tropism; troposphere; troubadour; zoetrope.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit trapate "is ashamed, confused," properly "turns away in shame;" Greek trepein "to turn," tropos "a turn, direction, course," trope "a turning;" Latin trepit "he turns."