The word bigeminal means occurring in pairs or doubled. So, the synonyms for most bigeminal could be twofold, duplicated, dual, repetitive, twin, binary, bifold, coupled, bilaterally symmetrical or replicated. All these words signify the same meaning as the word bigeminal. They can be used interchangeably in sentences where you intend to convey the meaning of doubling or pairing of things. Therefore, next time when you come across a challenging writing task where you cannot use the word bigeminal, use any of the synonyms mentioned above to spice up your writing and captivate your readers more effectively.