noun

• The ma'oma'o, Gymnomyza samoensis, a large passerine bird native to Samoa.
• A common surname from Chinese, from Mandarin, usually referring to Mao Zedong.
• A card game, named after Mao Zedong, in which players attempt to shed all their cards without violating certain unspoken rules.
• A Sino-Tibetan language.
• A branch of the Omotic languages spoken in Ethiopia.
• (biochemistry) Initialism of monoamine oxidase. [(biochemistry) Either of two enzymes, found in the outer membrane of mitochondria, that degrade biogenic amines and are thus responsible for the destruction of transmitter substances at neuronal synapses.]