Is Greek ἀρά, prayer, cognate with Latin ara, altar?
Wiktionary had ἀράομαι, with the etymology pointing to a red-linked ἀρά. I created an entry for ἀρά based on LSJ, but I have no source of information on its etymology. Ara is supposed to come from old Latin asa and earlier from PIE h₂eHs-, which is about fire and hearths and is the origin of ἄζω, to dry, and possibly ἄσβολος, soot. Since the original Latin word had an "s" rather than an "r," maybe the phonetic similarity is coincidental -- in which case, is there a known etymology for ἀρά?