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Webster 1913 Edition

(jī′rȧ-tō̍-ry̆)

Adj.

Moving in a circle, or spirally; revolving; whirling around.

gyratory ‎(comparative more gyratory, superlative most gyratory)

gyratory ‎(plural gyratories)

(Britain) A large traffic roundabout with non-standard lane markings or priorities, or with buildings on the central island.