Definify.com
Webster 1913 Edition
Polyptoton
‖
Polˊyp-to′ton
,Noun.
[L., fr. Gr. [GREEK] having, or being in, many cases;
πολύσ
many + [GREEK] case.] (Rhet.)
A figure by which a word is repeated in different forms, cases, numbers, genders, etc., as in Tennyson’s line, – “My own heart's heart, and ownest own, farewell.”