Dec`i*mo*sex"to (?), n. [Prop., in sixteenth; fr. L. decimus tenth + sextus sixth.]
A book consisting of sheets, each of which is folded into sixteen leaves; hence, indicating, more or less definitely, a size of book; -- usually written 16mo or 16°.
© Webster 1913.
Dec`i*mo*sex"to, a.
Having sixteen leaves to a sheet; as, a decimosexto form, book, leaf, size.
© Webster 1913.