omniscientistn.
/ˌɒmnɪˈsʌɪəntɪst/, U.S. /ˌɑmnəˈsaɪən(t)əst/, /ˌɑmniˈsaɪən(t)əst/ A person who knows about, or is extremely proficient in, all or many subjects, esp. the sciences.
ΘΚΠ
the mind > mental capacity > knowledge > scholarly knowledge, erudition > large amount of knowledge > [noun] > possession of > one who has or claims
polyhistor1588
omniscian1593
walking dictionary1609
polymathist1621
polymath1624
callent1637
polyhistorian1669
at-all1672
omniscient1710
universalist1713
dictionary1734
know-all1800
Crichton1807
pantologist1840
pansophist1864
encyclopaedist1871
know-it-all1873
omniscientist1932
pointy-head1969
1932 R. A. Knox Broadcast Minds ii. 21 We are all omniscientists now, at least in ambition... It only remains that we should pride ourselves on knowing something about everything.
1948 A. O'Rahilly Relig. & Sci. iv. 32 We [sc. Roman Catholics] stand where we have always stood,..opposed to the usurpations and truculent dogmatism of the omniscientists.
1991 M. Ruse in M. Fisch & S. Schaffer William Whewell iv. 87 William Whewell: Omniscientist... There was virtually no area in early nineteenth-century science in which William Whewell failed to make suggestions, commments, experiments..and..critiques.
2001 Express (Nexis) 28 Dec. 2001 lw51 Our guest omniscientist, Beachcomber, polishes off the last remaining queries in our Why Isn't It tray.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).
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n.1932