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Answer for the clue "Rotation to the left ", 12 letters:
levorotation

Word definitions for levorotation in dictionaries

Wiktionary Word definitions in Wiktionary
n. rotation in an anticlockwise direction, especially such rotation of the plane of polarized light.

WordNet Word definitions in WordNet
n. rotation to the left [syn: counterclockwise rotation ] [ant: dextrorotation ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Levorotation \Le`vo*ro*ta"tion\, n. [Written also l[ae]vorotation .] [Levo- + rotation.] (Physics & Chem.) Rotation in the direction of an outgoing right-handed screw; counter-clockwise rotation; -- applied chiefly to the turning of the plane of polarization ...