from The Century Dictionary and Cyclopedia
- In prosody, of or pertaining to a group or series of seven half-feet; pertaining to or consisting of three feet and a half.
Sorry, no etymologies found.
On the other hand, secondary or subsidiary caesuras are found in both Greek and Latin; thus, a trithemimeral (after the 3rd half-foot) is combined with the hephthemimeral, which divides the verse into two unequal parts.
On the other hand, the hephthemimeral caesura (_i. e._ after the 7th half-foot) is common in Latin, but rare in Greek:
In the iambic trimeter (consisting of three dipodia or pairs of feet), both in Greek and Latin, the most usual caesura is the penthemimeral; next, the hephthemimeral: