Protein in urine â known as proteinuria (pro-tee-NU-ree-uh) â is excess protein found in a urine sample. Protein is one of the substances identified during a test to analyze the content of your urine (urinalysis). Low levels of protein in urine are normal. Temporarily high levels of protein in urine aren't unusual either, particularly in younger people after exercise or during an illness. Persistently high levels of protein in urine may be a sign of kidney disease.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: principal, school principal, head teacher, head(noun) the educator who has executive authority for a school. she sent unruly pupils to see the principal.
c.1300, ruler, governor; also main part; from principal (adj.) or from or influenced by noun uses in Old French and Latin. From mid-14c. in the sense of money on which interest is paid; 1827 as person in charge of a public school, though meaning head of a college or hall was in English from mid-15c.