Saw the word “arras” being used and didn’t quite know what it meant. Bit of a castle fortification or something? Turns out it’s a big tapestry hung on a wall. OK. But in looking it up get told this by Wikipedia:
Arras-class aviso, a class of thirty French avisos
Umm, yes, and no doubt when “aviso” is looked up it is defined as one of the 30 that make up the French arras class?