Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Supercell" Definition
noun
A severe thunderstorm with updrafts and downdrafts that are in near balance, allowing the storm to maintain itself for several hours. supercells often produce large hail, powerful downpours, very strong winds and sometimes tornadoes.
Source: Wiktionary
A repeating unit cell of a crystal that contains several primitive cells.
Source: Wiktionary
An unusually large storm cell.
Source: Merriam-Webster
A severe storm generated by such a cell.
Source: Merriam-Webster
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