1A designated section or column in a newspaper, magazine, or document — often used as a suffix, as in "letters column" or "job listings section."
新聞の投書欄に自分の意見を送った。
I submitted my opinion to the newspaper's letters column.
スポーツ欄には今朝の試合の記事が載っている。
This morning's match is covered in the sports section.
雑誌の最後に読者の質問に答える欄がある。
At the end of the magazine there's a section that answers readers' questions.
2A field or blank space in a form, web page, etc. where information is entered.
名前を書く欄はここです。フルネームでお願いします。
This is the field for your name. Please write your full name.
登録フォームのメール欄にアドレスを入力してください。
Please enter your address in the email field of the registration form.
備考欄には特に何も書かなくていい。
You don't need to write anything in particular in the remarks field.
3The original meaning of the word: a handrail, railing, or balustrade. This standalone usage is now uncommon.
古い橋の欄は木でできている。
The railing of the old bridge is made of wood.