adjective
Having a length and width that are different; not square or circular.
Roughly rectangular or elliptical.
(bookmaking) Having the horizontal axis of a page longer than the vertical; In landscape orientation.
noun
Something with an oblong shape.
A rectangle with length and width that are different.
An ellipse with minor and major axes that are different.
verb
To extend so as to form an oblong shape.
To give an oblong shape to.