外插 Traditional form: 外插 Pinyin (reading): wàichā Definitions: to extrapolate extrapolation (math.) (computing) to plug in (a peripheral device etc) Characters: 外 - out, outside, external; foreign; in addition 插 - to insert, to stick in; to pierce; to plant Traditional characters: 外 - out, outside, external; foreign; in addition 插 - to insert, to stick in; to pierce; to plant