An Etymological Dictionary of Astronomy and Astrophysics

Math.: To estimate the value of a result outside the range of a series of known values.

Etymology (EN): From → extra- + (inter)polate, → interpolate.

Etymology (PE): From borun, → extra- + yâftan,
yâbidan “to find, discover; to obtain, acquire;” Mid.Pers. ayâftan, ayâpênitan “to reach, attain;” Manichean Mid.Pers. ‘y’b “to attain;” Parthian, Sogdian (+ *pati-) pty’b “to reach, obtain;” Av. ap- “to reach, overtake,” apayeiti “achieved, reached;” Skt. âp- “to reach, gain,”
âpnoti “reaches, gains;” Gk. hapto, haptomai “to touch, cling to, adhere to;” L. apiscor “touch, reach;” PIE base *ap- “to take, reach.”