diuturnal

Diuturnal, dī-ū-tur′nal, adj. lasting long.—n.

The diuturnal petticoat of snow which clothed the mountain was getting shorter and shorter as the diurnal sun crept farther and farther north on his summer ascension.

Adj. durable; lasting &c. v.; of long duration, of long-standing; permanent, endless, chronic, long-standing; intransient†, intransitive; intransmutable†, persistent; lifelong, livelong; longeval†, long-lived, macrobiotic, diuturnal†, evergreen, perennial; sempervirent†, sempervirid†; unrelenting, unintermitting†, unremitting; perpetual &c.