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Insecticidal is the describing word for something that kills insects. An insecticidal spray, powder, or soap is made to kill bugs — on plants, in a house, or on a farm. The chemical itself is usually called an ; insecticidal tells you what kind of thing you are looking at. Though actually, labels and everyday talk sometimes treat the two as the same word, as if insecticidal were the name of the bottle. In careful English it is not. You meet it in gardening, farming, and science, not in ordinary chat. on an ant is not “insecticidal.” The word is about a substance (or a property) whose job is to kill insects.
殺蟲的（形容詞；藥劑本身叫「殺蟲劑」）
組成insect (“insect”) + -icidal (“that kills”). Same idea as insecticide + the describing ending -al.
同家族的字
- insecticidethe chemical; insecticidal describes it
- insectthe first piece: the bug being killed
- pesticidesame -cide “killing” piece; pesticide is the bigger family
- herbicidesame -cide piece, but for killing plants
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，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。
insecticidaladj
- 1
Of, relating to, or being insecticide; insect-killing.
- The insecticidal properties of sulphur were also known to the Romans, for in about 200 B.C. Cato suggested that its fumes should be allowed to blow through trees to kill the vine fetter.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。