[Rhythmical series], [2532], [2533].
names of, gender, [405], [406];
decl., [518], [519], [549], [554], [556].
defined, [183];
nature of, [184];
three kinds, noun roots, verb roots, pron. roots, [186];
two or more forms of one root, [187];
vowel and cons. roots, [188];