noun
Standard loanword for a telescope, used in astronomy and general contexts. Less common than the native term 望遠鏡 (ぼうえんきょう), but understood.
彼は新しいテレスコープで星を観察した。
He observed the stars with his new telescope.
望遠鏡 is the standard Japanese word for telescope, more common than テレスコープ. テレスコープ is a direct loanword and may sound slightly technical or stylish.
Borrowed from English 'telescope'.