octodecimo
noun
a book size of about 4 × 6 1/4 inches (10 × 16 centimeters), determined by printing on sheets folded to form 18 leaves or 36 pages. 18mo, 18°
The grammatical form denoting more than one person, place, thing, or idea.
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Tillotson on the upper, in a little dark platoon of octodecimos.
From The Atlantic Monthly, Volume 01, No. 01, November, 1857 A Magazine of Literature, Art, and Politics by Various