HOAR Meaning of HOAR in English adj musty; moldy; stale. 2. hoar ·noun hoariness; antiquity. 3. hoar ·vt to become moldy or musty. 4. hoar ·adj gray or white with age; hoary. 5. hoar ·adj white, or grayish white; as, hoar frost; hoar cliffs. Webster English vocab. Английский словарь Webster. 2012