What is the X in X-mas?
late 14c., from Latin secundarius "pertaining to the second class, inferior," from secundus (see second (adj.)). Of colors, from 1831; of education, from 1809. Of sex characteristics from 1780. Opposed to primary or principal. Related: Secondarily.
secondary sec·ond·ar·y (sěk'ən-děr'ē)
Of the second rank; not primary.
Derived from what is primary or original.
Of or relating to a chemical compound characterized or formed by replacement of two atoms or radicals within a molecule.
Of, relating to, or being a degree of health care intermediate between that offered in a physician's office and that available at a research hospital, as the care typically offered at a clinic or community hospital.