What is "combining form"

n. 1 (context: grammar) A type of word part; a bound morpheme; used in combination with a word, a different combining form, or an affix to form a new word. 2 (context computing typography English) A (w character encoding character encoded) from a sequence of other characters instead of a (w: precomposed character).

n. a bound form used only in compounds; "`hemato-' is a combining form in words like `hematology'"