1 2 ac Abbreviation for the ability t o gain information about without the environment using the normal senses.(E?P) 13ac In anatomy , where the legs join the abdomen. (5) (g?o?n) 15ac (c?t?????) mountains,range in New York State and the setting for Washington Irving`s Rip Van Winkle.(8) 29ac Characteristic of a bear.(6) (??s??e)