Webster's Revised Unabridged Dictionary · 1913

Oblong

Oblong , adjective

[Latin oblongus; ob (see Ob-) + longus long: compare French oblong.]

Having greater length than breadth, esp. when rectangular.

Oblong , noun

A rectangular figure longer than it is broad; hence, any figure longer than it is broad.
The best figure of a garden I esteem an oblong upon a descent. — Sir W. Temple