different between methylene vs piperonal

English

French méthylène, from Ancient Greek ???? (méthu, “wine”) + ??? (húl?, “wood”).

methylene (countable and uncountable, plural methylenes)

(organic chemistry) The divalent radical CH₂< in which the free valencies are part of single bonds.
(organic chemistry) The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.
(organic chemistry) The unstable carbene CH₂:

piperonal (uncountable)

(organic chemistry) The methylene ether of 3,4 dihydroxy benzaldehyde; used in perfume to give a floral note

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