hypermeter

from The Century Dictionary.

• noun In prosody: A verse or period having one more syllable at the end than properly belongs to the meter which it represents; especially, a heroic hexameter with an additional syllable in the last foot, usually intended to be elided by synaphea before a vowel beginning the next line; a dolichurus.
• noun A period consisting of more than two or three cola; a hypermetron.
• noun A line or meter with one syllable beyond the last complete foot or measure.
• noun Anything greater than the ordinary standard of measure.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Pros.) A verse which has a redundant syllable or foot; a hypercatalectic verse.
• noun Hence, anything exceeding the ordinary standard.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A hypercatalectic line, i.e. with two syllabes beyond the metrum.
• noun A period with a redundant syllable.