## Meanings
1. A thick liquid from plants or animals used in cooking.
2. A dark liquid found underground and used as fuel and for making products.
3. To put oil on something to make it work smoothly.

## Examples
- Heat some oil in the pan before adding the vegetables.
- The country earns most of its money from oil.
- You should oil the door hinge to stop it squeaking.

## Derived Forms
- bio-oil
- bromoil
- butteroil
- castor-oil
- deoil
- enoil
- enoiling
- lamp-oil
- nonoil
- oil-burning
- oil-canning
- oil-digger

## Roots and Affixes
- Root: oyle
- Root: olie
- Root: oleum
- Root: ἔλαιον

## Etymology
From Middle English oyle, oile (“olive oil”), borrowed from Anglo-Norman olie, from Latin oleum (“oil, olive oil”), from Ancient Greek ἔλαιον (élaion, “olive oil”), from ἐλαία (elaía, “olive”). Compare Proto-Slavic *lojь. More at olive. Doublet of oleum. Supplanted Middle English ele (“oil”), from Old English ele (“oil”), also from Latin.

## AI Etymology
Oil comes from Middle English oyle, oile (“olive oil”), borrowed from Anglo-Norman olie, from Latin oleum (“oil, olive oil”), from Ancient Greek ἔλαιον (élaion, “olive oil”), from ἐλαία (elaía, “olive”). Compare Proto-Slavic *lojь. Doublet of oleum. Supplanted Middle English ele (“oil”), from Old English ele (“oil”), also from Latin. Modern senses include a thick liquid from plants or animals used in cooking and a dark liquid found underground and used as fuel and for making products. The wider word family includes derivatives such as bio-oil, bromoil, butteroil, castor-oil, deoil, and enoil.

## Topics
- Materials & Substances
- Energy & Industry

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