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  • WordNet 3.6
    • adj concavo-concave concave on both sides
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Webster's Revised Unabridged Dictionary
    • a Concavo-concave Concave or hollow on both sides; double concave.
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Century Dictionary and Cyclopedia
    • concavo-concave Concave or hollow on both surfaces, as a lens. Lenses of this kind are more frequently termed double-concave lenses. See lens.
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Chambers's Twentieth Century Dictionary
    • adjs Concavo-concave concave on both sides of a lens
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Chambers's Twentieth Century Dictionary
L. concavus, from con, inten., and cavus, hollow. See Cave.


In literature:

Concavo-convex: hollowed out or concave on one surface, rounded or convex on the other; like a small segment of a hollow sphere.
"Explanation of Terms Used in Entomology" by John. B. Smith