The Collaborative International Dictionary of English v.0.48:

Runic \Ru"nic\, a.
   Of or pertaining to a rune, to runes, or to the Norsemen; as,
   runic verses; runic letters; runic names; runic rhyme.
   [1913 Webster]

   Runic staff. See Clog almanac, under Clog.

   Runic wand, a willow wand bearing runes, formerly thought
      to have been used by the heathen tribes of Northern Europe
      in magical ceremonies.
      [1913 Webster]

WordNet (r) 3.0 (2006):

runic
    adj 1: relating to or consisting of runes; "runic inscription"

The Free On-line Dictionary of Computing (19 January 2023):

runic

    Obscure, consisting of runes.

   VMS fans sometimes refer to Unix as "RUnix".  Unix fans
   return the compliment by expanding VMS to "Very Messy Syntax"
   or "Vachement Mauvais Systeme" (French; literally "Cowlike Bad
   System", idiomatically "Bitchy Bad System").

   (1996-09-17)


The Jargon File (version 4.4.7, 29 Dec 2003):

runic
 adj.

    Syn. obscure. VMS fans sometimes refer to Unix as ‘Runix’; Unix fans
    return the compliment by expanding VMS to ‘Very Messy Syntax’ or ‘Vachement
    Mauvais Système’ (French idiom, “Hugely Bad System”).