The Collaborative International Dictionary of English v.0.48:

-logy \-lo*gy\suff. [Gr. ?, fr. lo`gos word, discourse, fr.
   le`gein to speak. See Logic.]
   A combining form denoting a discourse, treatise, doctrine,
   theory, science; as, theology, geology, biology, mineralogy.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Logy \Lo"gy\ (l[=o]"g[=e]), a. [From D. log.]
   Heavy or dull in respect to motion or thought; as, a logy
   horse; feeling logy. [U.S.]

   Syn: sluggish; dull; lethargic.
        [1913 Webster +PJC]

              Porcupines are . . . logy, sluggish creatures.
                                                  --C. H.
                                                  Merriam.
        [1913 Webster]

WordNet (r) 3.0 (2006):

logy
    adj 1: stunned or confused and slow to react (as from blows or
           drunkenness or exhaustion) [syn: dazed, foggy,
           groggy, logy, stuporous]