noun

• (meteorology, uncountable) Balls or pieces of ice falling as precipitation, often in connection with a thunderstorm.
• (meteorology, countable) An occurrence of this type of precipitation; a hailstorm.
• (countable, by extension) A rapid, intense barrage by a large number of projectiles or other objects.
  "Their lack of good intelligence also meant that they vastly overestimated the size of their foes for far too long, hails of armor-piercing shells doing comparatively little damage compared to the high explosive that they should have been using."

verb

• (impersonal) To have hailstones fall from the sky.
  "They say it's going to hail tomorrow."
• (intransitive) To send or release hail.
  "The cloud would hail down furiously within a few minutes."

adj

• (obsolete) Healthy, whole, safe.

verb

• (transitive) To greet; give salutation to; salute.
  "[…] Farewel happy Fields / Where Joy for ever dwells: Hail horrours, hail / Infernal world, and thou profoundeſt Hell / Receive they new Poſſeſſor: […]"
• (transitive) To name; to designate; to call.
  "Such a Son as all men hail'd me happy;"
• (transitive) To call out loudly in order to gain the attention of.
  "Hail a taxi."
• (transitive) To call out loudly in order to gain the attention of.
  "In Melbourne, you would usually have to hail a tram when you are travelling late at night and there are no other passengers waiting at your stop."