NilesB said:The glossary, where definitions of unusual or specificly defined terminology goes.
Ok, wizards glossary it is.
wizards glossary said:A divine spell belonging to a domain. Each domain offers one spell of each spell level. In addition to their normal daily complement of spells, clerics can cast one domain spell per day for each spell level that their caster levels allow. This spell may be from either of their domains. Domain spells cannot be exchanged for cure or inflict spells.
A divine spell belonging to a domain.
Cure light wounds is a spell belonging to the healing domain.
The radiants ability requiers casting a domain spell from the healing domain.
Still nothing about it needing to be cast from the domain slot to get the benefit though.