the thin, watery, slightly viscid fluid secreted by the salivary glands: it serves as an aid to swallowing and digestion by moistening and softening food, and contains enzymes which convert starch to dextrin and maltose
See saliva in American Heritage Dictionary 4
(sə-līˈvə)
noun
The watery mixture of secretions from the salivary and oral mucous glands that lubricates chewed food, moistens the oral walls, and contains ptyalin.