• WordNet 3.6
    • n incurvature a shape that curves or bends inward
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Century Dictionary and Cyclopedia
    • n incurvature A curving or the state of being curved.
    • n incurvature Specifically, in entomology: The state of being curved inward.
    • n incurvature A part or margin curved inward, or toward the median line.
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Chambers's Twentieth Century Dictionary
    • Incurvature any curving
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In literature:

An unusual excurvature or incurvature of the spine.
"Guide to West Point, and the U.S. Military Academy" by Various