Webster's Revised Unabridged Dictionary · 1913

Alp

Alp ({not transcribed}) , noun

[Latin Alpes the Alps, said to be of Celtic origin; compare Gael. alp a high mountain, Ir. ailp any huge mass or lump: compare French Alpes.]

1.
A very high mountain. Specifically, in the plural, the highest chain of mountains in Europe, containing the lofty mountains of Switzerland, etc.
Nor breath of vernal air from snowy alp. — Milton
Hills peep o'er hills, and alps on alps arise. — Pope
2.
Figuratively: Something lofty, or massive, or very hard to be surmounted.

The plural form Alps is sometimes used as a singular. “The Alps doth spit.”

Alp , noun

A bullfinch. — Rom. of R