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Answer for the clue "A plant sterol that is converted into vitamin D by ultraviolet radiation ", 10 letters:
ergosterol

Word definitions for ergosterol in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context steroid hormone mycology English) 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.

Wikipedia Word definitions in Wikipedia
Ergosterol (ergosta-5,7,22-trien-3β-ol) is a sterol found in cell membranes of fungi and protozoa , serving many of the same functions that cholesterol serves in animal cells . Because many fungi and protozoa cannot survive without ergosterol, the enzymes ...

WordNet Word definitions in WordNet
n. a plant sterol that is converted into vitamin D by ultraviolet radiation

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
ergosterol \ergosterol\ n. a plant sterol that is converted into vitamin D by ultraviolet radiation.

Usage examples of ergosterol.

He arose at the crack of dawn, when he began to take his secret medicines: potassium bromide to raise his spirits, salicylates for the ache in his bones when it rained, ergosterol drops for vertigo, belladonna for sound sleep.