adjective plain and without any extras or adornments.
noun any of numerous climbing plants of the genus Vanilla having fleshy leaves and clusters of large waxy highly fragrant white or green or topaz flowers.
noun a flavoring prepared from vanilla beans macerated in alcohol (or imitating vanilla beans).
— synonyms: vanilla_extract
noun a distinctive fragrant flavor characteristic of vanilla beans.
Examples
“You can tell that the secret ingredient missing from New CokeTM was vanilla, because certain South American economies collapsed when it was introduced, and miraculously revived when the old formula was used again.”