RULES FOR ASPIRATION 17
homorganics d, n, t, l, s: ceann an duine “the person’s head”,
gan toradh “without fruit”, slat tirim “a dry rod”, dhá
chapall déag “twelve horses”.
s is never aspirated in the groups sc-, sm-, sp-, st-.
s before a vowel or l, n, r is changed to t after the article
an, and written ts-:
(a) an tsráid “the street”, an tsagairt “of the priest”, an
tsrotha “of the stream”;
(b) den tsaol “(out) of the world”, don tsagart “to the
priest”, den tslait “from the rod”, sa tsruth “in the
stream”, sa tsnáthaid “in the needle”.
Special rules for aspiration after prepositions:
s- is not aspirated after the preposition gan:
bás gun sagart “death without a priest”.
ar “on” does not aspirate the initial of a following noun:
(a) when the sense is general: ar bord “on board (ship)” in
contrast to ar bhord “on a table”, ar muir “at sea”,
ar buile “angry”, ar meisce “drunk”.
(b) in phrases with a verbal noun expressing a state or
condition: ar bogadh “steeping”, ar crochadh “hanging”,
ar siúl “going on, happening”.
gan “without” does not aspirate a following noun when the
noun is part of a verbal noun phrase:
gan capall do cheannach “without buying a horse”, “not
to buy a horse”.
Non-aspiration occurs also in gan pósadh “unmarried”, gan
peaca “sinless”, gan moill (beside gan mhoill) “without
delay”, féar gan baint “unmown hay”, etc.
thar “over, beyond” is subject to similar exceptions: thar
barr “excellent”, thar farraige “beyond the sea”, etc.