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See also: deag



From Middle Irish déc, from Old Irish deec, deac, from Proto-Celtic *dekam-kʷe (literally and ten), with loss of the first k by dissimilation.[1] Cognate with Scottish Gaelic deug and Manx jeig.




  1. -teen

Usage notes[edit]

  • Does not function as a suffix; functions as an entirely separate word. Follows the first part of the numeral as well as the noun (if any). Lenites in disjunctive numbers after (two) and in attributive numerals when the item counted is in the singular and ends in a vowel or is in the plural and ends in a slender consonant (except cinn):
ocht (eight) + ‎déag → ‎ocht déag (eighteen)
aon bhuachaill déageleven boys
trí cinn déagthirteen (items)
ceithre úll déagfourteen apples
cúigear déagfifteen (people)
sé bhád déagsixteen boats
seacht dteach déagseventeen houses
naoi mbliana déagnineteen years
(two) + ‎déag → ‎dó dhéag (twelve)
dhá ghiota dhéagtwelve pieces
trí mhadra dhéagthirteen dogs
ceithre méadair dhéagfourteen metres
Additionally, never lenites in ordinal numbers:
an t-aonú lá déagthe eleventh day
an ceathrú duine déagthe fourteenth person
an tseachtú mí déagthe seventeenth month

Derived terms[edit]

Related terms[edit]


Irish mutation
Radical Lenition Eclipsis
déag dhéag ndéag
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.


  1. ^ Schrijver, Peter (1993) “Varia IV. OIr. dëec, dëac”, in Ériu, volume 44, pages 181–84

Further reading[edit]