Definition in this text:

Literally, “Dravidian mantra words.” The Bodhisattvabhūmi defines Dravidian mantras as strings of syllables with no specific semantic domain. The fact that these mantras are specifically identified as “Dravidian” (Skt. drāmiḍa; Tib. ’gro lding) points to their origin among the speakers of Dravidian languages in South India.