MID

attrib.adj. 1 (usu. in comb.) that is the middle of (in mid-air; from mid-June to mid-July). 2 that is in the middle; medium, half. 3 Phonet. (of a vowel) pronounced with the tongue neither high nor low. [OE midd (recorded only in oblique cases), rel. to L medius, Gk mesos]