The Collaborative International Dictionary of English v.0.48:
Outermost \Out"er*most`\, a. [See Uttermost, Utmost, and cf. Outmost.] Being on the extreme external part; farthest outward; as, the outermost row. --Boyle. [1913 Webster]WordNet (r) 3.0 (2006):
outermost adj 1: situated at the farthest possible point from a center [syn: outermost, outmost]