Entry 1 sense Webster, 1913 Mycology /mīk-äl'-əj-ē/ · My·col·o·gy · IPA /maɪˈkɑ.lə.d͡ʒi/ 01 n. That branch of botanical science which relates to the mushrooms and other fungi. 1. That branch of botanical science which relates to the mushrooms and other fungi.