When European explorers discovered this tropical fruit in the Americas, they called them "pineapples" due to resemblance to what is now known as the pine cone.
Ananas = pineapple
I am assuming you are referring to the scientific name for a pineapple. Which would be Ananas comosus. The pineapple belongs to the Bromeliaceae family of plants. Botany simply differentiates the pineapple plant from its culinary uses.
"A beautiful pineapple" and "one beautiful pineapple" are literal English equivalents of the French phrase un bel ananas. The pronunciation of the masculine singular phrase in French will be "eh beh-la-na-na" or "eh beh-la-na-nas" depending upon the speaker's birthplace.
Ananas
The French word for pineapple is "ananas" (masc.).
Pineapple equates to ananas
pineapple
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Anamas. From (http://en.wikipedia.org/wiki/Pineapple)
Ananas comosus.
die Ananas
Ananas comosus