| Main Entry: | |
| Part of Speech: | noun |
| Definition: | sunken or decayed area |
| Synonyms: | armpit, atrium, basin, bursa, caries, chamber, crater, decay, dent, depression, gap, hole, hollow, pit, pocket, sinus, socket, vacuity, void |
| Main Entry: | sac |
| Part of Speech: | noun |
| Definition: | bag |
| Synonyms: | bursa, cavity, cyst, pocket, pouch, sack, vesicle |