adhastar, halter. Sc. Gaelic adhastar. Manx eistyr, Middle Irish adastar, cf. Welsh eddestyl, steed.
adhbhal, great, immense, vast. (Din) so Sc. Gaelic. vast, awful. Old Irish adbul; ad-bol. IE root bhel, swell, as in Eng. bloom. Zimmer compares with Skr. bala, strength. Stokes and Osthoff give root bel, bol, strong, big; Skr. balam; strength. Gk. βελτιώνω/beltiono, better. Lat. de-bilis; weaker. Church Slavonic; boliji, greater. cf. bailceach (Osthoff) and bail, buil. Bailc, strong.
adhlacadh, burial. Sc. Gaelic adhlac. Old Irish adnacul, sepulchrum; root verb nanko, I bring. Lat. nancisor. IE nenk, enk as in thig.
béalteine/bealtaine, May-day. Sc. Gaelic bealltuinn. Early Irish beltene, belltaine; belo-te(p)nia (Stokes), "bright-fire", where belo- is allied to Eng. bale ("bale-fire"), Ang. Sax. bael, From Old English bælfyr (“balefire, funeral or sacrificial fire”), related to bæl and fyr. From Germanic *bālo, from Proto-Indo-European *bʰel-. Cognate with the Old Norse bál (whence the Icelandic bál (“a fire; a conflagration”), Danish bål (“fire, bonfire, pyre”), Norwegian bål and Swedish bål (“pyre, bonfire”)). Proto-Indo-European cognates include Sanskrit भाल (bhāla, “splendour”), Ancient Greek φαλός (phalos, “white”) and Old Armenian բալ (bal, “fog”).Lithuan. baltas, white. cf. Gaulish gods Belenos and Belisama & Shakespeare's Cym-belina. "Two needfires were lit on Bealtaine among the Gael, between which they drove their cattle for purification and for luck. Hence the proverb, "Eadair dá theine Bealltuinn", - "Between two Beltane fires" " (MacBain).
In Celtic mythology, Bel, Belenos (also Belenus) was a deity worshipped in Gaul, Cisalpine Gaul, and Celtic areas of Austria, Britain and Spain. He is particularly associated with Cornwall, West Cornwall being anciently called Belerion, the place of Bel. He was the Celtic sun god and had shrines from Aquileia on the Adriatic to Kirkby Lonsdale in England.[1][2]
The etymology of the name is unclear. Suggestions include "shining one,"[3] "the bright one"[4] and "henbane god".[5]
In the Roman period he was identified with Apollo.[1] There are currently 51 known inscriptions dedicated to Belenus, mainly concentrated in Aquileia and Cisalpine Gaul, but also extend into Gallia Narbonensis, Noricum, and far beyond.[4] Images of Belenus sometimes show him to be accompanied by a female, thought to be the Gaulish deity Belisama.[4]
In Asturias, Belenus persists as place name. For example the San Juan de Beleño village in Ponga municipality derives from the Celtic god..
In ancient Gaul and Britain, Apollo may have been equated with fifteen or more different Celtic names and epithets (notably Grannos, Borvo, Maponus, Moritasgus and others).[1] The legendary king Belinus in Geoffrey of Monmouth's History of the Kings of Britain is probably also derived from this god. The name of the ancient British king Cunobelinus means "hound of Belinos".
An epithet of Belenus may have been Vindonnus. Apollo Vindonnus had a temple at Essarois near Châtillon-sur-Seine in Burgundy. The sanctuary was based on a curative spring. Part of the temple pediment survives, bearing an inscription to the god and to the spirit of the springs and, above it, the head of a radiate sun-deity. Many votive objects were brought to the shrine, some of oak, and some of stone. Some offerings take the form of images of hands holding fruit or a cake; others represent the parts of the body requiring a cure. In many cases the pilgrims appear to have suffered from eye afflictions.[6]
Teutorix has been suggested as an epithet of Belenus as borrowed into Germanic religion.