sagitta noun. [sǝ'dʒɪtǝ, (esp. in sense 1) -'gɪt-, (esp. in sense 2) 'sadʒ-] M16.
[Latin, lit. 'an arrow'.]
1. (Usu. Sagitta.) (The name of) a small constellation of the northern hemisphere, lying in the Milky Way north of Aquila; the Arrow. M16.

2. a. Geometry. The versed sine of an arc. E18-M19.
b. Geometry & Optics. The line from the midpoint of a circular arc to the midpoint of its chord. E20.

3. Architecture. The keystone of an arch. E18.

4. The middle horizontal stroke in the Greek letter ε. M19.

[TahlilGaran] English Dictionary ▲