Lewis & Short

circum-flecto, xi, xum, 3, v. a.,

  1. I. to bend or turn about (Verg. and post-class. writers); prop. of the charioteer in the circus; hence, transf.’ longos cursus, Verg. A. 5, 131; 3, 430.
  2. II. Trop.: circumflexa saecula, returning upon themselves, Claud. VI. Cons. Hon. 391: anceps labyrinthus et error circumflexus, full of windings and turnings, Prud. Apoth. 71.
    1. B. In later gram. t. t., to mark with a circumflex, to pronounce as long (in Quint., instead of it, circumducere, q. v.): penultimam, Gell. 4, 7, 2: syllaba circumflexa, id. 4, 7, 2, § 4; Diom. p. 425 P.; Prisc. p. 1287 ib. et saep.
      Adv.: circum-flexē, with a circumflex: promere ( = pronuntiare) syllabam, Gell. 4, 7, 4: enuntiare syllabam, Porphyr. ad Hor. C. 4, 9, 1; id. ad Hor. S. 1, 1, 1.