• WordNet 3.6
    • n octameter a verse line having eight metrical feet
    • ***
Webster's Revised Unabridged Dictionary
    • Octameter (Chem) A molecule composed of eight monomer units bound to each other, usually in a linear array; as, an octomer formed of nucleotides is called an octonucleotide.
    • Octameter (Pros) A verse containing eight feet; as,Deep" in|to" the | dark"ness | peer"ing, | long" I | stood" there | wond'"ring, | fear"ing.
    • ***
Century Dictionary and Cyclopedia
    • octameter In prosody, consisting of eight measures (monopodies or dipodies).
    • n octameter In prosody, a verse or period consisting of eight measures. This word is little used, except in the sense of ‘octapody’ by some writers on modern versification who confound measure with foot.
    • ***


Webster's Revised Unabridged Dictionary
Cf.L. octameter, in eight feet. See Octa-, and meter


In literature:

Verses of seven and eight feet are rare; they are called heptameter and octameter, respectively.
"English: Composition and Literature" by W. F. (William Franklin) Webster