English word guanine comes from English phyllo- (Leaf, leaves.), English guano (Dung from a sea bird or from a bat.)

Detailed word origin of guanine

Dictionary entry	Language	Definition
phyllo-	English (eng)	Leaf, leaves.
guano	English (eng)	Dung from a sea bird or from a bat.
guanine	English (eng)	(chemistry) A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA.

Words with the same origin as guanine