noun
Refers to a transparent slide used in a projector, similar to a photographic slide. The term is somewhat dated; modern usage often prefers スライド.
See also: スライド
祖父は古い幻灯を整理していた。
My grandfather was sorting through old projection slides.
noun
magic lantern
Historical device for projecting images, a precursor to the slide projector. Often encountered in historical or literary contexts.
幻灯機は19世紀に人気があった。
Magic lanterns were popular in the 19th century.
Compound of 幻 (phantom, illusion) and 灯 (light), literally 'phantom light'. The term was coined in the late 19th century to describe the magic lantern and its slides.