proclitic

Concise Oxford English Dictionary © 2008 Oxford University Press:
proclitic /prə(ʊ)ˈklɪtɪk/ Linguistics

▶noun a word pronounced with so little emphasis that it forms part of the following word, e.g. at in at home. Compare with enclitic.

– derivatives
proclitically adverb.

– origin C19: from mod. L. procliticus (from Gk proklinein ‘lean forward’), on the pattern of late L. encliticus (see enclitic).