憂陀那
Từ Điển Thuật Ngữ Phật Học Hán Ngữ
udāna, cf. 優, 烏, etc. Breathing upwards from the throat into the head; guttural sounds; the navel, umbilical; the middle; volunteered remarks or addresses by the Buddha, sermons that came from within him without external request; voluntarily to testify.