To heal. 1. To cover, as a roof, with tiles, slate, lead, or the like. 2. To make hale, sound, or whole; to cure of a disease, wound, or other derangement; to restore to soundness or health. 3. To grow sound; to return to a sound state; as, the limb heals, or the wound heals; -- sometimes with up or over; as, it will heal up, or over.