1A razor — a thin, sharp blade used for shaving facial or body hair. Comes in many forms: disposable, replaceable-blade, T-shape, or I-shape. The kanji 剃刀 exists, but in modern Japanese カミソリ in katakana is standard, especially on product packaging. Also used metaphorically: カミソリのように鋭い describes a sharp mind or sharp words.
毎朝カミソリで髭を剃ってから出勤する。
I shave with a razor every morning before heading to work.
ドラッグストアで使い捨てのカミソリをまとめ買いした。
I bulk-bought disposable razors at the drugstore.
カミソリの刃が古くなると肌を傷つけやすい。
When a razor's blade gets old, it can easily nick the skin.
彼の判断はカミソリのように鋭いと評判だ。
He has a reputation for razor-sharp judgment.
古い小説には床屋がかみそりで髭を剃る場面がよく出てくる。
Old novels often have scenes of a barber shaving someone with a straight razor.