Adagium, adágij, n.g. Plaut.A prouerbe: an olde sayd sawe.
Lewis and Short: Latin dictionary
ădăgĭum, i, n. [prob. ad and aio, but acc. to Paul. ex Fest. p. 12 Müll., ad agendum apta, applicable to life, suitable for use], a proverb, an adage: vetus adagium est, Nihil cum fidibus graculo, Gell. 1, praef.