Webster's Revised Unabridged Dictionary · 1913

Circumflex

Circumflex , noun

[Latin circumflexus a bending round, from circumflectere, circumflexum, to bend or turn about; circum + flectere to bend. See Flexible.]

1.
A wave of the voice embracing both a rise and fall or a fall and a rise on the same a syllable. — Walker
2.
A character, or accent, denoting in Greek a rise and of the voice on the same long syllable, marked thus [~ or {not transcribed}]; and in Latin and some other languages, denoting a long and contracted syllable, marked [{not transcribed} or ^]. See Accent, n., 2.

Circumflex , transitive verb

To mark or pronounce with a circumflex. — Walker

Circumflex , adjective

[Compare Latin circumflexus, p. p.]

1.
Moving or turning round; circuitous. [Rare] — Swift
2.
(Anatomy) Curved circularly; -- applied to several arteries of the hip and thigh, to arteries, veins, and a nerve of the shoulder, and to other parts.