Enclitic /(ĕn*klĭt"ĭk)/

En·clit·ic

Enclitic

a.
  1. 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. (Gram.)

Enclitic

n.
  1. A word which is joined to another so closely as to lose its proper accent, as the pronoun thee in prithee (pray thee). (Gram.)