octameter

 A verse containing eight feet; as, --
Deep\'b6 in|to\'b6 the | dark\'b6ness | peer\'b6ing, | long\'b6 I | stood\'b6 there | wond'\'b6ring, | fear\'b6ing.  [1913 Webster]

 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.  [PJC]