Where does “morto” come from?

morto (Portuguese) comes from Old Portuguese morto, from Vulgar Latin mortus, from Latin mortuus, from Proto-Italic mortwos, from Proto-Indo-European mr̥twós, from Proto-Indo-European mer- — to die; to disappear; sea, lake, wetland.

morto (Portuguese): dead; exhausted; a dead person; someone who has...