[ foh-lee-oh ]
/ ˈfoʊ liˌoʊ /

noun, plural fo·li·os.


pertaining to or having the format of a folio: a folio volume.

verb (used with object), fo·li·oed, fo·li·o·ing.

to number each leaf or page of.
Law. to mark each folio in (a pleading or the like) with the proper number.

Nearby words

  1. foliicolous,
  2. foliiferous,
  3. folin's test,
  4. folinate,
  5. folinic acid,
  6. folio recto,
  7. folio verso,
  8. foliolate,
  9. foliole,
  10. foliose

Origin of folio

1525–35; < Latin foliō (orig. in phrase in foliō in a leaf, sheet), ablative of folium folium

folio verso

[ foh-lee-oh vur-soh; Latin foh-lee-oh wer-soh ]
/ ˈfoʊ liˌoʊ ˈvɜr soʊ; Latin ˈfoʊ liˌoʊ ˈwɛr soʊ /


the back of the page; verso (opposed to folio recto).

Origin of folio verso

From Latin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for folio

British Dictionary definitions for folio


/ (ˈfəʊlɪəʊ) /

noun plural -lios


relating to or having the format of a folioa folio edition

verb -lios, -lioing or -lioed

(tr) to number the leaves of (a book) consecutively

Word Origin for folio

C16: from Latin phrase in foliō in a leaf, from folium leaf

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for folio



mid-15c., from Late Latin folio "leaf or sheet of paper," from Latin folio, ablative of folium "leaf," from PIE *bhulyom "leaf" (cf. Greek phyllon "leaf," Gaelic bile "leaflet, blossom"), from root *bhel- (2) "to blow, inflate, swell" (see bole). Ablative of location, because this was used in page references. Meaning "volume of the largest size" first attested 1620s.

Online Etymology Dictionary, © 2010 Douglas Harper