Question

what mean by hydroids of ester?​

Answer 1

See, hydroid is any member of the invertebrate class Hydrozoa (phylum Cnidaria)

I think you mean 'hydrolysis of water'

Ester hydrolysis is a reaction that breaks an ester bond with a molecule of water or a hydroxide ion to form a carboxylic acid and an alcohol. One common use of ester hydrolysis is to create soaps, which are the salts of fatty acids from triglycerides. This process is called saponification.

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