concavity

Founding-era definition · Webster's 1828 American Dictionary

CONCAVITY, noun Hollowness; the internal surface of a hollow spherical body, or a body of other figure; or the space within such body.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI

More founding-era words: liberty · virtue · republic · justice · providence · commerce · militia · arms · prudence · establishment · religion · usurpation · tyranny · citizen · unalienable · sovereign