Bipetalous is a botanical term that describes flowers that have two petals. However, there are many synonyms that can be used in place of this word, including bilabiate, two-lipped, two-flowered, and dichlamydeous. Bilabiate and two-lipped are terms that are commonly used to describe flowers in the mint family, while dichlamydeous is a more general term that refers to flowers with two distinct whorls of petals. Two-flowered is a less commonly used synonym that is still valid, but it may be confused with plants that have two flowers growing from a single stem. Overall, there are many options when it comes to synonyms for the word bipetalous, depending on the specific context and type of flower being described.