Indochina /ˌɪndoʊ̯ˈt͡ʃaɪ̯nə/ noun2 •(old-fashioned) A peninsula and geographic region of Southeast Asia, consisting of the mainland portion, not including islands such as those of Indonesia. •(historical) A former French colony in Southeast Asia comprising the peninsula containing Vietnam, Cambodia and Laos; in full, French Indochina.
