- 1石蕊（學校多說石蕊試紙；比喻用法指檢驗標準）
Litmus is a dye, first taken from certain mosses, that chemists use as a simple test. On paper it turns red when it touches acid and blue when it touches an (a base — the opposite side from acid, like soap or baking soda). School science meets ‘litmus paper’ more often than the bare word. Though actually, in grown-up English the lab sense is not the one you hear most. People say a litmus test for a quick check that shows where someone really stands — a question or a moment that makes the truth show itself, the way the paper changes colour. That use is a picture borrowed from the lab, not a second chemical. The colours themselves are worth keeping straight: red for acid, blue for .
組成From Middle English spellings such as litmose, from Old Norse litmosi, ‘moss used for dyeing’: lita ‘to dye, stain’ + mosi ‘moss’. The dye-word goes back to a Germanic root for appearance or colour.
同家族的字
- mossthe second half of the old Norse compound meant moss
原始詞典資料3 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。
litmusnoun/ˈlɪtməs/
- 1
A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels.
- 2
A simple test of acidity in a liquid using litmus, usually in the form of litmus paper.
- 3
A simple test of any attribute; a litmus test.
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。