An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A suffix of adjectives, meaning "of, relating to, or resembling," as in polar "of or relating to": molecular, "being": spectacular.

M.E., from O.Fr. -er, from L. -aris, variant of -alis, → -al.

An adjective and noun suffix denoting thing or person belonging to or connected with.

From L. -arius, -aria, -arium "connected with, pertaining to; the man engaged in."

-i, Mid.Pers. -ig, -ik, → -ics.

A wavelength calibration of astronomical spectra using a helium-argon light source.

→ helium; → argon; → calibration.

A comparison light source containing the known spectral lines of helium and Argon.

→ helium; → argon; → lamp.

Same as → Indian numeral system.

→ numeral; → system.

A unit of angle equal to one thousandth of an → arcsecond, or 1/3 600 000 degree.

→ milli-; → arcsecond.

A measure of angle smaller than 1 arcsecond, usually until 0.1 arcsecond.

→ sub-; → arc second.

Imaging in excellent seeing conditions using an adequate detector to obtain stellar images whose profile lies in the sub-arcsecond range.

→ sub-arcsecond; → imaging.