The phrase "partial skull" refers to a part of a person's head bone. It means that only a section of the skull is present, not the entire thing. Full definition
But scientists examining the 30 - million - year - old partial skulls of two dwarf dolphins found that not only were they missing their pearly whites, but the snub - nosed cetaceans likely slurped up their prey from the seafloor. (sciencemag.org)
In the early 1960s, a team led by palaeoanthropologists Louis and Mary Leakey found a deformed lower jaw, hand and partial skull in Olduvai Gorge, Tanzania. (scientificamerican.com)
The fossil bed found in Brazil contained hundreds of bones from roughly 50 individual pterosaurs, including partial skulls and jawbones, according to the study. (ibtimes.com)