noun.
The scientific study of the characteristics of the skull, such as size and shape, especially in humans.
The Century Dictionary and Cyclopedia
noun.
That branch of anatomy which deals with the study of crania or skulls; the sum of human knowledge concerning skulls.
the GNU version of the Collaborative International Dictionary of English
noun.
The department of science (as of ethnology or archæology) which deals with the shape, size, proportions, indications, etc., of skulls; the study of skulls.