Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Something added or attached to an entity of greater importance or size; an adjunct. synonym: attachment.
  • noun Biology A part or organ, such as an arm, leg, tail, or fin, that is joined to the axis or trunk of a body.

from The Century Dictionary.

  • noun That which is appended to something as a proper part of it; a subordinate attached part of anything.
  • noun Something added to a principal or greater thing, though not necessary to it, as a portico to a house.
  • noun Synonyms Adjunct, attachment, appurtenance, addition, concomitant.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Something appended to, or accompanying, a principal or greater thing, though not necessary to it, as a portico to a house.
  • noun (Biol.) A subordinate or subsidiary part or organ; an external organ or limb, esp. of the articulates.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun an external body part that projects from the body
  • noun a natural prolongation or projection from a part of any organism
  • noun a part that is joined to something larger

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an external body part that projects from the body
  • noun a part that is joined to something larger
  • noun a natural prolongation or projection from a part of an organism either animal or plant

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

append +‎ -age

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