2. Noun. A precious item saved and used in regifting, from ''Lord of the Rings'': "Anything that Hobbits ''had no immediate use for, but were unwilling to throw away'', they called a mathom. Their dwellings were apt to become rather crowded with mathoms, and ''many of the presents that passed from hand to hand were of that sort''. ¹
¹ Source: wiktionary.com