pl of fungus.
2. fungi ·noun ·pl ·see fungus.
3. fungi ·add. ·noun ·pl a group of thallophytic plants of low organization, destitute of chlorophyll, in which reproduction is mainly accomplished by means of asexual spores, which are produced in a great variety of ways, though sexual reproduction is known to occur in certain phycomycetes, or so-called algal fungi.