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Webster 1913 Edition

Octodecimo

Ocˊtodec′i-mo

,
Adj.
[L.
octodecim
eighteen. See
Octavo
,
Decimal
, and
-mo
.]
Having eighteen leaves to a sheet;
as, an
octodecimo
form, book, leaf, size, etc.

Ocˊto-dec′i-mo

,
Noun.
;
pl.
Octodecimos
.
A book composed of sheets each of which is folded into eighteen leaves; hence; indicating more or less definitely a size of book, whose sheets are so folded; – usually written 18mo or 18°, and called
eighteenmo
.

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