That which belongs to something else; an adjunct; an
   appendage; an accessory; something annexed to another thing more
   worthy; in common parlance and legal acceptation, something belonging
   to another thing as principal, and which passes as incident to it, as a
   right of way, or other easement to land; a right of common to pasture,
   an outhouse, barn, garden, or orchard, to a house or messuage. In a
   strict legal sense, land can never pass as an appurtenance to land.