Oblong \Ob"long\, n. 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.
Source: Webster's Revised Unabridged Dictionary (1913)
Oblong \Ob"long\, a. [L. oblongus; ob (see Ob-) + longus long: cf. F. oblong.] Having greater length than breadth, esp. when rectangular.