Accessory

Part of speech: noun (n.)

1. That which belongs to something else deemed the principal; something additional and subordinate. "The aspect and accessories of a den of banditti." Carlyle.

2. Same as Accessary, n.

3. Anything that enters into a work of art without being indispensably necessary, as mere ornamental parts. Elmes.

Synonyms: Abettor; accomplice; ally; coadjutor. See Abettor.

Part of speech: adjective (a.)

Accompanying as a subordinate; aiding in a secondary way; additional; connected as an incident or subordinate to a principal; contributing or contributory; said of persons and things, and, when of persons, usually in a bad sense; as, he was accessory to the riot; accessory sounds in music.

Synonyms: Accompanying; contributory; auxiliary; subsidiary; subservient; additional; acceding.