| Word | Definitions | Synonyms |
|---|---|---|
| ibex | (noun) wild goat of mountain areas of Eurasia and northern Africa having large recurved horns | Synonyms: Capra ibex |
| ibis | (noun) wading birds of warm regions having long slender down-curved bills | - |
| ibuprofen | (noun) a nonsteroidal anti-inflammatory and analgesic medicine (trade names Advil and Motrin and Nuprin) used to relieve the pain of arthritis and as an antipyretic | Synonyms: Advil, isobutylphenyl propionic acid, Motrin, Nuprin |