Constellation between Cygnus and Aquila

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

Wikipedia Word definitions in Wikipedia
In geometry , the sagitta (sometimes abbreviated as sag ) of a circular arc is the distance from the center of the arc to the center of its base. It is used extensively in architecture when calculating the arc necessary to span a certain height and distance ...

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 ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sagitta \Sa*git"ta\, n. [L., an arrow.] (Astron.) A small constellation north of Aquila; the Arrow. (Arch.) The keystone of an arch. [R.] --Gwilt. (Geom.) The distance from a point in a curve to the chord; also, the versed sine of an arc; -- so called from ...