pa·tent adj \ˈpat-ənt, British usually ˈpāt-\
: protected by a trademark or a trade name so as to establish proprietary rights analogous to those conveyed by a patent : proprietary <patent drugs>
\ˈpāt-\: affording free passage : being open and unobstructed <the nose patent with no pathological discharge—Journal of the American Medical Association>
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