2 definitions found From The Collaborative International Dictionary of English v.0.44 [gcide]: Sextodecimo \Sex'to*dec"i*mo\, adjective [L. sextus-decimus the sixteenth; sextus the sixth (fr. sex six) + decimus the tenth, from decem ten. See {-mo}.] Having sixteen leaves to a sheet; of, or equal to, the size of one fold of a sheet of printing paper when folded so as to make sixteen leaves, or thirty-two pages; as, a sextodecimo volume. From The Collaborative International Dictionary of English v.0.44 [gcide]: Sextodecimo \Sex'to*dec"imo\, noun; pl. {Sextodecimos}. A book composed of sheets each of which is folded into sixteen leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 16mo, or 16[deg].

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