- 1增白劑、漂白用品；（英式）咖啡奶精、奶精粉（non-dairy creamer）
Noun. A substance you add to something to make it . The two everyday meanings sit in different rooms of the house.
In the laundry room: a whitener is a product put in the wash to make white clothes look bright white again, since cotton goes grey and yellow over time. Bleach is one kind; there are also 'optical brighteners' that do not remove stains but make the cloth reflect light so it looks . On packaging you will also see the adjective form: whitening powder, whitening agent.
In the kitchen: in British English a whitener is the powder or liquid you put in coffee or tea instead of milk — what many people call non-dairy creamer or coffee whitener. Offices and hotels keep little sachets of it. This use is a bit, but older speakers say it naturally.
Beyond those, the word attaches freely to whatever is being whitened: a tooth whitener, a skin whitener, a shoe whitener for canvas sneakers. It is a plain, practical word — you meet it on labels and in shops far more than in conversation, where people just name the actual product ("pass me the bleach").
組成whiten（使變白）+ -er。-er 這裡不是指人，而是指「做這件事的東西」——像 cleaner 清潔劑、opener 開罐器。
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Whitenername
- 1
A surname.
whitenernoun
- 1
Any substance used to whiten something; a bleach.
- 2
A person employed to whiten or bleach.
- 3
A powder added to tea or coffee in place of milk. A "non-dairy creamer".
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。