The Welsh word for sandwich is brechdan [ˈbrɛxdan], which comes from the Irish word brechtán (butter, fat), according to the Geiriadur Prifysgol Cymru.

However according to MacBain’s Dictionary, is related to the Scottish Gaelic word for pancake, breacag, which is related to breachdan (custard), which comes from the Middle Irish breachtán (a roll), which is related to the Welsh words brithog (mottled, variegated, multi-coloured, speckled, fine) and brith (marked with different colours, variegated, coloured, chequered, mottled, pied, spotted, speckled, brindled, grey), which are related to the word word breac (speckled) in Irish and Scottish Gaelic.

According to the Geiriadur Prifysgol Cymru, brechdan is a sandwich, and also a slice of bread and butter; sandwich; cake or shortbread.

There are also a number of interesting types of sandwich in Welsh:

– brechdan fawd / gorddi = slice of bread on which butter is spread with the thumb
– brechdan gaerog / ddwbl / linsi / fetal / deiliwr = an oatcake on a slice of buttered white bread or between two slices of white bread
– brechdan grasu = toast, toasted sandwich
– brechdan i aros pryd = slice of bread and butter to carry on with until the next meal, snack
– brechdan doddion = slice of bread spread with dripping
– brechdan driagl / driog = slice of bread spread with treacle

For details of the origins of the word sandwich, see Sandwiches and Portsmouths