I'm pretty sure it ain't written Parhelion (plur. Parhelia or Parenthelia) in the dictionnary, because all three of them have distinctive characteristics..
Btw, if Parhelia was a plural noun, the singular form would be Parhelium, not Parhelion.
Edit:
DukeP, the English plural of "virus" is "viruses". In Latin, people still aren't sure, since there isn't any classical Latin with the plural. If you absolutely must guess, then there's some hint that it's a 4th declension noun, and the plural would be "virus" with a long 'u'.



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