(a) Inside (a solid object); immersed, or partly immersed, in (a fluid substance); enclosed in (fire, the air, etc.); (b) into (a solid, liquid, etc.); (c) in or into the surface of (sth.), pierced or……
(a) Middle, mid-; mid strem, the middle of the stream; mid theigh (leg), the middle of the thigh (leg); in the mid se (sheld), in the middle of the sea (shield); in the mid side, ?in the middle; to……