au·ran·ti·a·ceous \ ̷ ̷| ̷ ̷ ̷ ̷|āshəs\adjective Etymology: in sense 1, from New Latin aurantium (specific epithet of Citrus aurantium) + English -aceous; in sense 2, from New Latin Aurantiaceae + English -ous 1.: relating to or resembling the sour orange 2.: of or relating to the family Rutaceae