Know how to use "fewer" and "less"? Find out.
1650s, of diseases, etc., from Latin eruptus, past participle of erumpere "to break out, burst" (see eruption). Of volcanoes, from 1770. Related: Erupted; erupting.
erupt e·rupt (ĭ-rŭpt')v. e·rupt·ed, e·rupt·ing, e·rupts
To break through the gums in developing. Used of teeth.
To appear on the skin. Used of a rash or blemish.