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An adjective for plastics and glues that harden permanently once they have been heated. Heat changes them inside — the tiny chains lock together — and after that they cannot be melted and reshaped. Heat them again and they will burn or crack, but they will not go soft. This is exactly what you want for things that must stay hard near heat: the black handle on a frying pan, electrical plugs and sockets, the boards inside computers, the glue holding plywood together. Common examples are epoxy, bakelite, and melamine. Used before a noun almost every time: thermosetting plastic, thermosetting resin, a thermosetting adhesive. It is a materials-science and factory word; you will meet it in technical writing, not conversation. Its opposite is thermoplastic, which can be and reshaped as often as you like.
熱固性（塑膠）
組成thermo- 'heat', from Ancient Greek θερμός (thermós) 'hot', + setting, from 'set' in the sense of 'become firm and hard' — the way jelly sets or cement sets. So: it sets when heated.
同家族的字
- setthe everyday verb 'to set' = become hard, as glue or jelly does
- thermoplasticsame thermo- 'heat'; the opposite kind of plastic
- thermalsame thermo- 'heat'
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。
thermosettingadj
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chemistrynatural-sciencesphysical-sciencesBecoming permanently (irreversibly) hard or solidifying when heated.
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。