In an anatomical direction toward or relating to the skull; from an anatomical perspective concerning the cranium.
From 'cranial' (relating to the skull) plus '-ly' (the adverb-forming suffix). Creates an adverb meaning 'in the direction of or concerning the skull'.
The adverb '-ly' is so common that we barely notice it—but it comes from Old English '-lice' meaning 'in the manner of', and it's been glued to adjectives for over 1000 years turning them into descriptions of how things happen!
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