Enclitic
Enclitic (en*klit"ik) , adjective
[Latin encliticus, Greek 'egkli`tikos, from 'egkli`nein to incline; 'en in + kli`nein to bend. See In, and Lean, v. i.]
(Grammar) Affixed; subjoined; -- said of a word or particle which leans back upon the preceding word so as to become a part of it, and to lose its own independent accent, generally varying also the accent of the preceding word.
Also: Enclitical
Enclitic , noun
(Grammar) A word which is joined to another so closely as to lose its proper accent, as the pronoun thee in prithee (pray thee).