purine definition by Wordo

Noun

Any

of

a

class

of

organic

heterocyclic

compounds

,

composed

of

fused

pyrimidine

and

imidazole

rings

,

that

constitute

one

of

the

two

groups

of

organic

nitrogenous

bases

(

the

other

being

the

pyrimidines

)

and

are

components

of

nucleic acids

.