n.a bone containing edible marrow; used especially in flavoring soup
英汉双解大词典
marrowbone(marrowbones)
1.
N-VAR（有变体名词） Marrowbones are the bones of certain animals, especially cows, that contain a lot of bone marrow. They are used in cooking and in dog food. (尤指母牛等动物的)髓骨