Phys. [mod.L., f. Gr. ἔνδο-ν (see ENDO-) + καρδί-α heart.] The smooth membrane lining the cavities of the heart.
1872. Huxley, Physiol., ii. 36. There is, however, an internal membranous and epithelial lining, called the endocardium.
1877. Roberts, Handbk. Med. (ed. 3), II. 36. It rarely happens that the endocardium is seen in the early period of inflammation.
