blo

It is borrowed from Middle Dutch bloc (“felled tree trunk”), modern Dutch blok; the DEAF and the FEW give the Dutch word as the etymon. The TLFi and the DHLF suggest that its several senses may have…

It is inherited from Late Latin blāvus (“blue”), a Latin form first found in Isidore of Seville and in glosses of the 8th and 9th centuries. The Latin word is from Frankish *blāo (“blue”), according…