A small ghost; a minor or insignificant ghost; a ghostly apparition of small size or power.
From 'ghost' + '-let' suffix (meaning small, as in 'booklet,' 'droplet'). A playful or archaic term, likely more literary than common.
The '-let' suffix specifically means 'small version of,' which is why we have piglets (baby pigs), booklets (small books), and theoretically ghostlets (tiny ghosts)—it's productive enough that English speakers understand new '-let' words instantly.
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