Loaf (?), n.; pl. Loaves (#). [OE. lof, laf, AS. hlāf; akin to G. laib, OHG. hleip, Icel. hleifr, Goth. hlaifs, Russ. khlieb', Lith. klëpas. Cf. Lady, Lammas, Lord.] Any thick lump, mass, or cake; especially, a large regularly shaped or molded mass, as of bread, sugar, or cake. Bacon.
[1913 Webster]

Loaf sugar, refined sugar that has been formed into a conical loaf in a mold.
[1913 Webster]

Loaf, v. t. To spend in idleness; -- with away; as, to loaf time away.
[1913 Webster]