luí

See also: lui, Lui, luì, and -lui

Irish

From Old Irish lige (“act of lying down; bed”),[1] from Proto-Celtic *legyom, from Proto-Indo-European *legʰ- (“to lie (down)”).

(Munster) IPA^(key): /l̪ˠɪː/[2]
(Cois Fharraige) IPA^(key): /l̪ˠəi/ (corresponding to the form loighe)
(Ulster) IPA^(key): /l̪ˠɪː/[3]; /l̪ˠəi̯/, /l̪ˠɔi̯/[4] (corresponding to the form loighe)

luí

luí m (genitive singular as substantive luí, genitive as verbal noun luite)

verbal noun of luigh
(act or state of) lying down, prostration
Tá mé i mo luí.
I am lying down.
setting (of heavenly bodies)
luí na gréine ― sunset

luí na gealaí ― moonset
inclination, tendency
Tá luí chun léirscriosta aige.
He has a propensity to destruction.

G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “1 lige”, in eDIL: Electronic Dictionary of the Irish Language
Sjoestedt, M. L. (1931) Phonétique d’un parler irlandais de Kerry (in French), Paris: Librairie Ernest Leroux, § 121, page 65
Quiggin, E. C. (1906) A Dialect of Donegal, Cambridge University Press, § 112, page 44
Quiggin, E. C. (1906) A Dialect of Donegal, Cambridge University Press, § 149, page 59

From Proto-Celtic *ɸlowī (“rudder”) (compare Welsh llyw), from Proto-Indo-European *plew- (“flow”). Cognate with Ancient Greek πλόος (plóos, “sailing”), English float.

luí f (genitive luae)

Feminine ī-stem
	Singular	Dual	Plural
Nominative	luí^L	luí^L	luí^H
Vocative	luí^L	luí^L	luí^H
Accusative	luí^N	luí^L	luí^H
Genitive	luae^H	luae^L	luae^N
Dative	luí^L	luaib	luaib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

Old Irish mutation
Radical	Lenition	Nasalization
luí also lluí after a proclitic	luí pronounced with /l(ʲ)-/	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.