Usage Note
Lave refers to molten rock emitted by a volcano, both during eruption (coulée de lave) and once cooled (roche de lave). It is feminine: une lave. Note that lave is also the third-person singular present of laver ('he/she washes'), so context disambiguates the noun from the verb form.
Examples
"La lave descend lentement du cratère."
Natural Translation
The lava flows slowly from the crater.

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