The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of numerous enzymes that catalyze the hydrolysis of esters of phosphoric acid and are important in the absorption and metabolism of carbohydrates, nucleotides, and phospholipids and in the calcification of bone.
n. Any of several enzymes that hydrolyze phosphate esters, and are important in the metabolism of carbohydrates, nucleotides and phospholipids, and in the formation of bone.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates
Word Usage
"Alkaline phosphatase is also found in bone and may be elevated during growth spurts."