contra-

Từ điển Oxford Advanced Learner 8th

contra- BrE [ˈkɒntrə] NAmE [ˈkɑːntrə] combining form
1. (in nouns, verbs and adjectives)against; opposite
•contraflow
•contradict
2. (in nouns) (music)having a ↑pitch an ↑octave below
•a contrabassoon

Word Origin:
[contra-] from Latin contra ‘against’.