dat-

See also: Appendix:Variations of "dat"

Old Irish

Pronunciation

IPA^(key): /dad/

Prefix

dat- (class B & C infixed pronoun, triggers lenition)

alternative form of dot- (“thee, you (singular object pronoun)”)

Old Irish affixed pronouns
person	infixed			suffixed
See Appendix:Old Irish affixed pronouns for details on how these forms are used. Note that the so-called “infixed” pronouns are technically prefixes, but they are never the first prefix in a verbal complex.
person	class A	class B	class C	suffixed
1 sg	m-^L	dom-^L, dam-^L		-um
2 sg	t-^L	dot-^L, dat-^L, dut-^L, dit-^L		-ut
3 sg m	a-^N, e-^N	d-^N	id-^N, did-^N, d-^N	-i, -it
3 sg f	s-^(N)	da-		-us
3 sg n	a-^L, e-^L	d-^L	id-^L, did-^L, d-^L	-i, -it
1 pl	n-	don-, dun-, dan-		-unn
2 pl	b-	dob-, dub-, dab-		-uib
3 pl	s-^(N)	da-		-us

^L means this form triggers lenition.
^N means this form triggers nasalization (eclipsis)
^(N) means this form triggers nasalization in some texts but not in others.

Welsh

Alternative forms

dad-

Etymology

See dad-.

Pronunciation

IPA^(key): /dat/

Prefix

dat-

undo, un-, dis-
‎dat- + ‎plygu (“to fold”) → ‎datblygu (“to unfold, to develop”)

‎dat- + ‎cuddio (“to hide”) → ‎datguddio (“to reveal”)

‎dat- + ‎drysu (“to entangle, to confuse”) → ‎datrys (“to disentangle, to solve”)
re-
‎dat- + ‎canu (“to sign”) → ‎datgan (“to announce, to declare”)

Derived terms

Welsh terms prefixed with dat-

Mutation

Mutated forms of *dat-*
radical	soft	nasal	aspirate
dat-	ddat-	nat-	unchanged

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

References

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “dat-”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies