de·nom·i·na·tor
noun/dɪˈnɒmɪneɪtə(r)/
/dɪˈnɑːmɪneɪtər/
(mathematics)- the number below the line in a fraction showing how many parts the whole is divided into, for example 4 in ¾
分母 Word Originmid 16th cent.: from French dénominateur or medieval Latin denominator, from denominare ‘to name’, from de- ‘away, formally’ + nominare ‘to name’.