duodecimo noun & adjective. [dju:ǝʊ'dɛsɪmǝʊ] M17.
[Latin (in) duodecimo in a twelfth (sc. of a sheet), formed as DUODECIMAL.]
A. noun. Pl. -os. A size of book or paper in which each leaf is one-twelfth of a standard printing-sheet. (Abbreviation 12mo.) M17.
b. attrib. or as adjective. Of this size, in duodecimo; fig. diminutive. L18.

[TahlilGaran] English Dictionary ▲