fungal /ˈfʌŋɡəl/adjective 1noun 1forms 1 adjective1 •Of or pertaining to a fungus or fungi.Doctors determined that the cause of the itchy rash was fungal rather than bacterial. noun1 •(no longer used) A fungus.Fungals are distinguished from Lichens by their more fugitive nature, their more succulent texture, their want of a thallus or expansion independent of the part that bears the reproductive matter, […] — 1847 formsfungals