- (also bone marrow)[uncountable]
a soft substance that fills the hollow parts of bones 骨髓 - (British English) [uncountable, countable]
a large, long vegetable that grows on the ground. Marrows have dark green skin and are white inside. 西葫芦 
Word OriginOld English mearg, mærg (in sense (1)), of Germanic origin; related to Dutch merg and German Mark. Sense (2) dates from the early 19th cent.