fanatic collector; collecting maniac
Wasei-eigo from 'collect mania'; refers to a person obsessed with collecting things. Rare term; more common synonyms include 収集家 or コレクター.
wasei-eigo (Japanese-coined English), from collect mania
See also: 収集狂
He is a stamp-collecting fanatic, always hunting for rare stamps.
Variant with interpunct; less common but sometimes seen.
Wasei-eigo from English 'collect' + 'mania'. The exact derivation is uncertain, but it likely emerged in Japanese to describe an obsessive collector.