'Heirloom' definitions:

Definition of 'heirloom'

From: WordNet
noun
(law) any property that is considered by law or custom as inseparable from an inheritance is inherited with that inheritance
noun
Something that has been in a family for generations

Definition of 'Heirloom'

From: GCIDE
  • Heirloom \Heir"loom`\, n. [Heir + loom, in its earlier sense of implement, tool. See Loom the frame.] Any furniture, movable, or personal chattel, which by law or special custom descends to the heir along with the inheritance; any piece of personal property that has been in a family for several generations. [1913 Webster]
  • Woe to him whose daring hand profanes The honored heirlooms of his ancestors. --Moir. [1913 Webster]