Marrow, in animal economy, an oily matter secreted by the arteries of the internal membrane, which covers the bones. Its particular use, to the living body, has not hitherto been clearly ascertained ; though it is probably of the same service to the bones, as fat is to the soft parts ; namely, to render their fibres less brittle, by its lubricating property.

With regard to its medicinal effects, marrow is doubtless more subtle and penetrating than any other animal fat; and ought therefore to be eaten with great caution. As it is much relished by epicures, it will be proper to observe, that marrow is with difficulty digested, unless thinly spread on toasted bread, with the addition of salt, and used with moderation.—We believe, however, that it might with more advantage and propriety be employed for liniments and ointments prepared for immediate application ; because it will, in this respect, be found superior to hog's-lard, though it more speedily turns rancid.