enemy
Concise Oxford English Dictionary © 2008 Oxford University Press:
enemy/ˈenəmi/
▶noun (pl. enemies) a person who is actively opposed or hostile to someone or something.
■ (the enemy) [treated as sing. or pl.] a hostile nation or its armed forces in time of war.
– origin ME: from OFr. enemi, from L. inimicus, from in- ‘not’ + amicus ‘friend’.
'enemy' also found in these Oxford entries:
Anasazi
- anti-aircraft
- Apache
- arch-
- arch-enemy
- ASDIC
- bandit
- barrage balloon
- beak
- betray
- biological control
- blackout
- bogey
- bridgehead
- close
- collaborate
- counter-attack
- counter-espionage
- counteroffensive
- coup
- cover
- cyberwar
- defilade
- double agent
- E-boat
- enmity
- Fabian
- fiend
- fireship
- foe
- foray
- foxhole
- front line
- Greek fire
- harry
- host
- hostile
- hunter-killer
- inimical
- interdict
- kamikaze
- kill
- letter of marque
- line
- listening post
- loot
- mercy
- misericord
- mortal

