lemon
The word 'citron' in French translates to 'lemon' in English. It is used when talking about the citrus fruit, just as in English. For example, 'J'aimerais un thé au citron' means 'I would like a lemon tea'.
This lemon cake is delicious.
This phrase is a simple statement containing an adjective (délicieux/delicious) to describe a noun (gâteau au citron/lemon cake). It represents an everyday use of the French language.
The lemon is an acidic fruit.
In this sentence, we provide a characteristic of a lemon, which is that it is an acidic fruit. It's a basic use of the adjective (acide/acidic) to describe a noun (le citron/lemon).
I love the taste of lemon in water.
This phrase indicates a personal preference for a specific flavor in water (the taste of lemon). The verb 'aime/love' is used to express the preference.