asyntactic

asyntactic [ey-sin-tak-tik] Word Origin adjective Grammar. (of compounds)

1. consisting of morphemes that are combined differently from their mode of combination as separate words in a phrase, as bookstore, which is an asyntactic compound, while the same elements are combined syntactically in store for books.

Origin of asyntactic First recorded in 1875–80; a-6 + syntactic