An Etymological Dictionary of Astronomy and Astrophysics

1. Derived or derivative; not primary or original.
   

2. Belonging or pertaining to a second order, division, stage, period, rank, grade, etc.
   

3. → secondary body.
   

See also:
→ secondary atmosphere, → secondary calibrator, → secondary cell, → secondary cosmic rays, → secondary crater, → secondary eclipse, → secondary electrons, → secondary emission, → secondary mirror, → secondary star.

Etymology (EN): From → second + -ary a suffix occurring on adjectives (elementary; honorary; stationary) and
nouns denoting objects, especially receptacles or places (library; rosary; glossary).

Etymology (PE): Dovomân, from dovom, → second.