தமிழ் - தமிழ் அகரமுதலி
    தானம் , முயற்சி , அளவு , பொருள் , வடிவு முதலிய ஏதுக்களினால் ஒரு வகைப்பட்டுவரும் எழுத்துகள் ; முயற்சிவகையால் ஒன்றற்கொன்று இனமான எழுத்துகள் .

தமிழ் லெக்சிகன் - Tamil Lexicon
  • ஒருசாதி யெழுத்துக்கள். (நன். 71, உரை.) Letters of a main class, as those related to each other, which relationship is determined, in the case of consonants, according to the organs which articulate them, as the explosives and their corresponding nasals: and, in the case of vowels, according t

வின்சுலோ
  • ''s.'' Relative letters --as the hard letters are to their re spective nasals, or vice versa; also let ters formed from the same sources which in the consonants run in couplets through the alphabet, and the long vowels to the short, and vice versa, இன மாயுள்ளவெழுத்துக்கள்.

சென்னைப் பல்கலைக்கழகம் (DSAL)
  • n. < id. +.(Gram.) Letters of a main class, as thoserelated to each other, which relationship isdetermined, in the case of consonants, according to the organs which articulate them,as the explosives and their correspondingnasals: and, in the case of vowels, according tothe degree of tenseness of the tongue, as theshort and their corresponding long vowelsounds, the diphthongs ai, and au being taken with i and u respectively; ஒருசாதி யெழுத்துக்கள். (நன். 71, உரை.)