Vowels: Proto-Dravidian had ten vowels: a, ā, e, ē, u, ū, i, ī, o, ō. There was contrast between short and long vowels. There were no diphthongs. ai and au are treated as *ay and *av (or *aw) (Subrahmanyam 1983, Zvelebil 1990, Krishnamurti 2003).
Consonants: Proto-Dravidian is reconstructible with the following consonantal phonemes (Subrahmanyam 1983:p40, Zvelebil 1990, Krishnamurti 2003) :
| Labial | Dental | Alveolar | Retroflex | Palatal | Velar | Glottal |
Plosive | p | t | ṯ | ṭ | c | k | |
Nasal | m | n | ṉ (??) | ṇ | ñ | | |
Flap | | | r | | | | |
Fricative | | | | ḻ (ṛ, r̤) | | | (H) |
Lateral | | | l | ḷ | | | |
Approximant | v | | | | y | | |
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