Proclitic

Proclitic \proh-KLIT-ik\ , adjective;
1. Of a word: Closely connected in pronunciation with the following word and not having an independent accent

This word is first attested in 1805 from Latin procliticus with influence from Greek procliticus. The Latin word is based on the root cliticus from encliticus ("a word that leans its accent on the preceding word"). Encliticus comes from Greek egklitikss, which is a combination of en + klinein ("on" + "to lean").

Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Friday, August 26
Etymologies come from the Oxford English Dictionary and/or Etymonline.com