We don't have synonyms for ergosterol yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ergosterin and ergosterols.
(n) :
(biochemistry, steroids, mycology) The steroid precursor of vitamin D₂. It is found in cell membranes of fungi, and is their functional equivalent of cholesterol. It is also found in the membranes of some protists.
(n) :
(biochemistry, steroids, mycology) The steroid precursor of vitamin D₂. It is found in cell membranes of fungi, and is their functional equivalent of cholesterol. It is also found in the membranes of some protists.