To-thé-mûi (Eng-gí: polymerase "po-lí-me-la-suh") sī chi̍t lūi kàⁿ-sò͘, choan-bûn tī hu̍t-sng ê tn̂g-liān he̍k-chiá to-thé ê ha̍p-sêng. DNA to-thé-mûi kap RNA to-thé-mûi hun-pia̍t to̍h sī teh chō͘-ha̍p DNA kap RNA hun-chú.