gregicideadj.
Etymology: < Latin greg(i)-, grex, flock, crowd + -cide comb. form1; after regicide.Previous versions of the OED give the stress as: ˈgregicide.
1796 (title) Thoughts on the prospect of a Gregicide War, in a Letter to the right hon. Edmund Burke.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2021).