Vampeels are half-vampires; also called "dhampyres/dhampirs" or "daywalkers". Generally, they are born from a vampire (male) mating with a human (female). Lore suggests they live from twice to six times as long as humans, if not immortal. They also have some of the usual advantages of vampires (such as enhanced strength, ability to transform, etc) and less or none of their weaknesses (aversion to sunlight, garlic, dependent on human blood, no reflection). They are generally spurned or hunted by both vampires and humans, and will usually try to live among humans by hiding their true natures.
"Blade" (from the movies starring Wesley Snipes) is an example of a vampeel/daywalker from popular fiction.