One of the mysteries of the English language finally explained.
Any of several ketones derived from pelargonic acid or obtained from oil of pelargonium; specifically a solid ketone originally obtained from the dry distillation of barium pelargonate; dioctyl ketone, heptadeca-9-one, CH₃(CH₂)₇·CO·(CH₂)₇CH₃.
Mid 19th century. From pelarg- + -one.
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