[1] : The Collaborative International Dictionary of English v.0.48

octameter \octam"eter\, n. cf.l. octameter in eight feet. see
   octa-, and meter. pros.
   a verse containing eight feet; as, 

         deepbprime in|tobprime the | darkbprimeness |
         peerbprimeing, | longbprime i | stoodbprime there
         | wond'bprimering, | fearbprimeing.  --poe.
   1913 webster
see also:
octa- meter 

[2] : WordNet (r) 2.0

octameter
     n : a verse line having eight metrical feet

Octameter >> O Words
Octameter, definition of term: Octameter
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