thigmo-

From Ancient Greek θῐ́γμᾰ (thĭ́gmă) +‎ -o-, from the root of θῐγγᾰ́νω (thĭngắnō, “to touch”). (Can this⁽⁺⁾ etymology be sourced?)

thigmo-

1. (biology, botany) related to touching, usually a plant.

   Synonym: hapto-

   ‎thigmo- + ‎tropism (“movement, turning”) → ‎thigmotropism (“movement of a plant because of touching”)