excogitatorn.
/ɛksˈkɒdʒɪteɪtə/ One who excogitates.
ΘΚΠ
the mind > mental capacity > thought > [noun] > thinking out > one who thinks out
excogitator1847
1847 W. Hamilton Let. to De Morgan 28 An original excogitator of the doctrine.
This entry has not yet been fully updated (first published 1894; most recently modified version published online March 2018).
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n.1847