GC: n

S: http://enrin.grida.no/htmls/tadjik/vitalgraphics/eng/html/text_c7.htm (last access: 14 July 2015); https://carramar-natural-disasters.wikispaces.com/How+is+hail+formed%3F (last access: 14 July 2015).

N: 1. Old English hagolstan; see hail (n.) + stone (n.).
2. Globule or piece of ice, with a diameter varying between 5 and 50 mm or even more, the fall of which constitutes hail. Hailstones consist almost entirely of transparent ice, or of a series of layers of transparent ice with a thickness of at least 1 mm, alternating with translucent layers.

S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=hailstone&searchmode=none (last access: 14 July 2015). 2. METEOTERM/International Meteorological Vocabulary, WMO – No. 182 (last access: 14 July 2015).

SYN:
S:

CR: freezing fog, frost, glaze, hail, hoar frost, rime, sleet, small hail.