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Octodecimo, ok-tō-des′i-mō, adj. having eighteen leaves to the sheet, contracted 18mo.—adj.

Other sizes occasionally used are called “sixteenmo” or “sextodecimo,” “eighteenmo” or “octodecimo,” etc.

The whole of this transaction was, if I may so speak, in the naughty vanity of my heart, a sort of octodecimo illustration of the "VENI, VIDI, VICI" of a certain illustrious character of antiquity.

"It is from your Father in heaven,—behold it!" said he, in a dramatic accent, and pulling out of his breast-pocket a small octodecimo Bible.