opponent /ə-pōˈnənt/

1. The person opposed to one in a contest, struggle, battle, etc
2. Someone who opposes a course of action, belief, etc
3. An opponent muscle (anatomy)

1. Opposing
2. Antagonistic (with to; formerly with with)
3. Placed opposite or in front
4. (of a muscle) opposing one part (eg a digit) to another (anatomy)

• animosity
• animus
• animé
• anion
• anionic
• anions
• aniridia
• aniridic
• anis
• anise
• aniseed
• aniseed ball
• aniseed balls
• aniseeds
• anises
• anisette
• anisettes
• aniso-
• anisocercal
• anisodactylous
• anisogamies
• anisogamy
• anisomerous
• anisophyllous
• anisotropic