In this post we’re looking at words for board, plank and related things in Celtic languages.

Words marked with a * are reconstructions.

Middle Irish (Gaoidhealg)	tile, tiled = board, plank, stern
Irish (Gaeilge)	tile = board, plank, sheets, poop (deck)
Scottish Gaelic (Gàidhlig)	dèile [dʲeːlə] = board, deal, plank, bier
Manx (Gaelg)	deal = plank, batten

Etymology: from English deal [source] (a plank of softwood, a wooden board or blank), from Middle English dele (plank), from Middle Low German dele, from Old Saxon thili, ultimately from Proto-Germanic *þiljǭ (plank, board, plank, flooring, deck) [source].

Words from the same Diele (plank, hallway, hall, foyer) in German, tilja (floorboard, stage floor) in Swedish, and dilljá (bulkhead) in Pite Sami [source].

Middle Welsh (Kymraec)	astell, estyll = plank, board, shelf, lath, stave, rod
Welsh (Cymraeg)	astell [ˈastaɬ / ˈastɛɬ] = plank, board, shelf, lath, stave, rod, ledge (of rock) astell gerdd = music stand astell ddu = blackboard astell lyfrau = bookshelf astellaf, astellu = to board, batten astellddal = shelf astellog = boarded, planked astyllen = plank, board, shelf, lath, stave, rod, tablet, toilet, privy, latrine (y)styllen = plank, board, panel, shelf, lath, stave, mould-board
Middle Cornish (Cernewec / Kernuak)	astel = board, plank
Cornish (Kernewek)	astel = plank, shingle, splint astel an oles = mantelpiece astel grey = chalkboard astel todnow = surfboard astelwolyans = windsurfing astelyer = striker estyllen = shelf, board, plank
Breton (Brezhoneg)	astel = plank, flat piece of wood, extension leaf (of a table), shelf, crêpe spatula, (medical) splint astellad = vomiting astellat = to vomit astelladenn = emetic, to vomit

Etymology (Welsh & Cornish): from Latin astella (splinter), from asula / astla (splinter, shaving, chip, shiver, shingle) from assis (axel, North Pole, the heavens, board, plank), from Proto-Italic *aksis, from Proto-Indo-European *h₂eḱs-i-s, from *h₂eḱs- (axle, axis)[source]. The Breton words come from the same Latin roots, via Old French astelle (splinter or piece of wood) [source].

Words from the same roots include axis and axle in English, Achse (axis, axle) in German, axel (shoulder, axle, axis) in Swedish, and exio (axle, axis) in Portuguese, and words for axle and axis in Celtic language [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic