noun
time tunnel
Science fiction term for a passageway that enables travel through time.
そのSF映画では、主人公がタイムトンネルを通って過去へ行く。
In that sci-fi movie, the protagonist goes to the past through a time tunnel.
タイムマシン is a time machine (a device), while タイムトンネル is specifically a tunnel-like passage for time travel.
ワームホール is a wormhole, a theoretical spacetime shortcut; タイムトンネル is a more general sci-fi concept of a time-travel passage.
Variant with interpunct; less common but seen in some contexts.
Loanword from English 'time tunnel'.