Usage Note
Cactus is invariable in the plural — les cactus (not les cacti). In informal French, un cactus can mean a snag or problem — y a un cactus means 'there's a hitch.' The word is borrowed via Latin from Greek kaktos, a spiny plant.
Examples
"Son appartement est plein de cactus."
Natural Translation
His apartment is full of cacti.

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