primary battery or primary cell noun

A battery or cell producing an electric current by irreversible chemical action

primary care noun

The first level of health care, as provided by a general practitioner or nurse

primary coil noun

One carrying an inducing current

primary colours plural noun

1. Those from which all others can be derived by mixing, that is (for light) the three spectral colours red, green and blue, which, mixed equally, produce white light, or (for pigments) cyan, magenta and yellow, which, mixed equally produce black (printing), or (in general use) red, yellow and blue
2. Also, all the colours of the spectrum, red, orange, yellow, green, blue, indigo, and violet

primary meristem noun

Any of the three meristematic tissues in the developing plant embryo, from which epidermis, ground tissue and vascular bundles arise

primary planet noun

A planet distinguished from a satellite

primary process noun (psychiatry)

A thought process governed by the pleasure principle

primary production noun (ecology) see production under produce

primary school noun

A school providing primary education, usu for children between five and eleven years

primary stress noun (linguistics)

The main stress in a word, the stress that falls on the most heavily accented syllable