train-oil
/ˈtreɪnɔɪl/noun
mass noun
- chiefly historical oil obtained from the blubber of a whale (and formerly of other sea creatures), especially the right whale〈主史〉（尤指从露脊鲸上提取的）鲸油（旧时也指从其他海生动物身上提取的动物油）。
词源
mid 16th cent.: from obsolete train 'train-oil'， from Middle Low German trän, Middle Dutch traen, literally 'tear' (because it was extracted in droplets).