English word ectonucleotide comes from English nucleotide, English ecto- (Outside.)

Detailed word origin of ectonucleotide

Dictionary entry	Language	Definition
nucleotide	English (eng)	(biochemistry) The monomer constituting DNA or RNA biopolymer molecules. Each nucleotide consists of a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine; a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA); and a phosphate group.
ecto-	English (eng)	Outside.
ectonucleotide	English (eng)	(biochemistry) Any nucleotide found outside a cell.

Words with the same origin as ectonucleotide