- In the middle of the concave side, there is a groove twelve inches deep, in which the extremities of the axle are lodged, and turned round as there is occasion.
There are no more uses of "concave" in the book.
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- Of what use is genius, if the organ is too convex or too concave and cannot find a focal distance within the actual horizon of human life?
Emerson, Ralph Waldo -- Essays, Second Series
- He touched my head, which is our tradition, but my father was worried, as I had nothing but skin, no bone to protect my brain, and my head beneath the shawl was concave.
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Malala Yousafzai -- I Am Malala