Definitions of Mao:

• noun:   Chinese communist leader (1893-1976)
• noun:   an enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin)
• name:  A female given name (rare: 1 in 100000 females; popularity rank in the U.S.: #3550)
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #15422)