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.
Definition of school for Students. 1  1 : a place for teaching and learning. 2  2 : a session of teaching and learning night school You'll be late for school. 3  3 : schoolhouse. 4  4 : the teachers and pupils of a school The entire school was at the rally. 5  5 : a group of persons who share the same opinions and beliefs a new school of philosophy.