• WordNet 3.6
    • n cavum (anatomy) a natural hollow or sinus within the body
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Century Dictionary and Cyclopedia
    • cavum In anatomy, a hollow; the cavity of any organ: chiefly used, with reference to the cavities or sinuses of the heart, with a Latin adjective.
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In literature:

As the cavum medium increases in width in posterior sections, the lamina superior and lamina inferior lose their lateral connection.
"Cranial Osteiology of the Hylid Frog, Smilisca baudini" by Linda Trueb