blaincommon nounproper nounSyllable DecompositionblainEtymologyexpandPossibly from the name of the commune of Blain, located on the Nantes to Brest canal.Definition1. A very elongated flat-bottomed boat, with a square sail, that navigated the peat bogs and could carry up to 15,000 peat sods. The largest ones had two masts.expand