Declivities(pl. ) of Declivity
Declivity(n.) Deviation from a horizontal line; gradual descent of surface; inclination downward; slope; -- opposed to acclivity, or ascent; the same slope, considered as descending, being a declivity, which, considered as ascending, is an acclivity.
Declivity(n.) A descending surface; a sloping place.
Declivous(a.) Descending gradually; moderately steep; sloping; downhill.

Words within declivous