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The Collaborative International Dictionary
Precomposed

Precompose \Pre`com*pose"\, v. t. [imp. & p. p. Precomposed; p. pr. & vb. n. Precomposing.] To compose beforehand.
--Johnson.

Wiktionary
precomposed

a. 1 composed in advance 2 (context computing English) composed of a base character and a diacritical mark