Definition from Wiktionary, the free dictionary
This category contains only other categories, no dictionary entries. Its subcategories are on the topic: Petrochemistry. They are of two sorts:
- Subcategories named like "aa:Petrochemistry (with a prefixed language code) are categories of terms in specific languages. You may be interested especially in Category:en:Petrochemistry, for English terms.
- Subcategories of this one named without the prefixed language code are further categories just like this one, but devoted to finer topics.
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This category has the following 8 subcategories, out of 8 total.