† Roundheadismn.
Origin: Formed within English, by derivation. Etymons: roundhead n., -ism suffix.
Etymology: < roundhead n. + -ism suffix.
Obsolete.
rare.
1650 J. Bulwer 258 The City-Flat-Cap imitates the Brasilean Flat-Head, and is no other then a Grecian or Gallo-Grecian Round-headnisme [sic].
This entry has been updated (OED Third Edition, March 2011; most recently modified version published online June 2021).