pen·ta·none | \ˈpentəˌnōn\
plural -s

Definition of pentanone 

: either of two isomeric flammable liquid ketones derived from normal pentane:

a : the unsymmetrical compound CH3CH2CH2COCH3

called also methyl propyl ketone, 2-pentanone

b : the symmetrical compound (C2H5)2CO obtainable from propionic acid

called also diethyl ketone, 3-pentanone, propione

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History and Etymology for pentanone

pentane + -one

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to reject or criticize sharply

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