• WordNet 3.6
    • n endocranium membrane lining the inside of the skull
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Century Dictionary and Cyclopedia
    • n endocranium In zoology and anatomy, a collective name for the processes which project inward from the cranium of an animal, and serve to support the organs of the head: applied by Huxley to the hard pieces found in the head of an insect, and invisible without dissection. In the cockroach these form a cruciform partition in the middle of the head, and they assume various forms in other insects. Also called tentorium, and by Kirby cephalophragma.
    • n endocranium The lining membrane of the skull; the dura mater.
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In literature:

Endocranium: the inner surface of the cranium.
"Explanation of Terms Used in Entomology" by John. B. Smith