Relating to or involving an odd number and an even number; (Nuclear Physics) designating nuclei containing an odd number of protons and an even number of neutrons.
Origin
Late 19th century.
Definition of odd-even in US English:
odd-even
adjective
Relating to or involving an odd number and an even number; (Nuclear Physics) designating nuclei containing an odd number of protons and an even number of neutrons.