English Expression · Advanced
common caustic
potash
Pronunciation: say common caustic
Meaning
A historical term for potassium hydroxide or sodium hydroxide.
Example
In the old laboratory, they used common caustic for various chemical reactions.
In the old laboratory, they used common caustic for various chemical reactions.
Practice tips
- Practice common caustic out loud — read the pronunciation guide above and repeat.
- Use it in your own sentence today; reuse beats rereading.
- Pay attention to context: this English expression is for advanced-level learners.