aberemurder means premeditated murder. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From Old English ǣbǣre morþ, from ǣbēr (“open, blatant”) + morþ (“murder”). The second element was assimilated to English murder.
noun
- premeditated murder“Yet they had degrees of blood-shed, and made a difference in the punishment; for some sprung from sudden passion, but other was forethought and purposed; which last they called Abere Murther, or Murther by foreplot or treachery[…]”