[aw-toh] 
| a combining form meaning “self,” “same,” “spontaneous,” used in the formation of compound words: autograph. |
| a combining form representing automatic in compound words: autoalarm; autofeed; autofocus. Sometimes also taken as an adjective: auto enlarger; auto stop control. |
| au·to (ô'tō) n. pl. au·tos An automobile. intr.v. au·toed, au·to·ing, au·tos To go by or ride in an automobile. [Short for automobile.] |
auto- or aut-
pref.
Self; same: autogamy.
| auto-
A prefix meaning "oneself," as in autoimmune, producing antibodies or immunity against oneself. It also means "by itself, automatic," as in autonomic, governing by itself. |
| auto automobile |