Main entry: opposite, paired
Definition: of leaves etc; growing in pairs on either side of a stem
Usage: opposite leaves
Antonyms: alternate
Definition: of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired
Main entry: mated, paired
Definition: used of gloves, socks, etc.
Antonyms: mismatched
Definition: either not matched or unsuitably matched
Main entry: paired
Definition: mated sexually
Antonyms: unmated
Definition: not mated sexually