obverse

Concise Oxford English Dictionary © 2008 Oxford University Press:
obverse/ˈɒbvɜːs/

▶noun

• 1 the side of a coin or medal bearing the head or principal design.

• 2 the opposite or counterpart of a fact or truth.

▶adjective

• 1 of or denoting the obverse of a coin or medal.

• 2 corresponding to something as its opposite or counterpart.

– derivatives
obversely adverb.

– origin C17: from L. obversus, obvertere (see obvert).