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48 | 48th | 49 | 49th | 4th | 4to | 4wd | 5 | 5-hitter | 5-hydroxy-3-methylglutaryl-coenzyme a reductase | 5-hydroxytryptamine

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OXFORD DICTIONARY

4to

WORDNET DICTIONARY

4to(n = noun.attribute) quarto - the size of a book whose pages are made by folding a sheet of paper twice to form four leaves; Array

is a kind of size

4to, n.

the size of a book whose pages are made by folding a sheet of paper twice to form four leaves. [WordNet 1.5]

4to, abbr. quarto.

For further exploring for "4to" in Webster Dictionary Online