Constellation between Cygnus and Aquila

• A small constellation in the northern hemisphere between Cygnus and Aquila and crossed by the Milky Way
• The Arrow constellation
• Any arrowworm of the genus Sagitta

Wikipedia Word definitions in Wikipedia
Sagitta is a constellation. The word may also refer to: Sagitta (optics) , a measure of the glass removed to yield an optical curve Sagitta (geometry) , the depth of an arc Versine , a trigonometric function Sagitta (genus) , the chief genus of Chaetognatha ...

Wiktionary Word definitions in Wiktionary
n. 1 The keystone of an arch. 2 (context geometry English) The distance from a point in a curve to the chord; also, the versed sine of an arc; so called from its resemblance to an arrow resting on the bow and string. 3 (context anatomy English) The larger ...