iaith

Welsh

From Middle Welsh ieith, from Proto-Brythonic *jeiθ, from Proto-Celtic *yextis (compare Breton yezh (“language”), Cornish yeth (“language”), Old Irish icht (“tribe, people”)^[1]), from Proto-Indo-European *yek- (compare Latin jocus (“joke”), Old High German jehan (“to admit, to confess”), Tocharian A yask (“to demand, to beg”)). Doublet of jôc.

iaith f (plural ieithoedd or ieithiau or ieithau or ieithydd)

amlieithog (“multilingual”)
bratiaith (“argot, patois”)
cyfieithu (“to translate”)
Cymraeg ei iaith (“Welsh-speaking”)
dwyieithog (“bilingual”)
gormodiaith (“ exaggeration, hyperbole”)
gwlad heb iaith, gwlad heb genedl (“a land without a language is a land without a nation”)
heb iaith, heb genedl (“no language, no nation”)
heddlu iaith (“ language police”)
iaith arwyddion (“sign language”)
iaith glasurol (“classical language”)
ieithadur (“grammar book”)
ieithydd (“linguist”)
llediaith (“bad speech; foreign accent”)
meta-iaith (“metalanguage”)
tafodiaith (“dialect”)
uwchiaith (“metalanguage”)

Mutated forms of *iaith*
radical	soft	nasal	h-prothesis
iaith	unchanged	unchanged	hiaith

Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.

^ Matasović, Ranko (2009) Etymological Dictionary of Proto-Celtic (Leiden Indo-European Etymological Dictionary Series; 9), Leiden: Brill, →ISBN, page 435