(a) With ref. to a solid object, the body, a solidly filled object, etc.: on the outside; also, on the outside and enclosing interior matter
(b) with ref. to a solid mass: withinne and withouten,……
(a) Not enclosed or fully contained in (a part of the body, a container); also, not immersed in (water); above (ground)
(b) outside (an enclosed or a defined space), in the area beyond (an enclosing……