1. (noun)Lao, Laotian a member of a Buddhist people inhabiting the area of the Mekong River in Laos and Thailand and speaking the Lao language; related to the Thais
2. (adj)Lao the Tai language of a Buddhist people living in the area of the Mekong River in Thailand and Laos
3. (adj)Lao of or relating to a member of the Buddhist people inhabiting the Mekong river in Laos and Thailand