SUB-

sub- BrE AmE səb, ¦sʌb —As a productive prefix, ¦sʌb ( ˈ subcom ˌ mittee, ˌ••ˈ•• ); as a fossilized prefix, usually səb, §sʌb if the following syllable is stressed (sub ˈ stantial), ¦sʌb if not ( ˈ substance) .