The Collaborative International Dictionary of English v.0.48:

Archaeologic \Ar`ch[ae]*o*log"ic\
   ([aum]r`k[-e]*[-o]*l[o^]j"[i^]k), Archaeological
\Ar`ch[ae]*o*log"ic*al\ ([aum]r`k[-e]*[-o]*l[o^]j"[i^]*kal),
   Relating to arch[ae]ology, or antiquities; as,
   arch[ae]ological researches. -- Ar`*ch[ae]*o*log"ic*al*ly,
   adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

archaeological
    adj 1: related to or dealing with or devoted to archaeology; "an
           archaeological dig"; "a dramatic archaeological
           discovery" [syn: archaeological, archeological,
           archaeologic, archeologic]