Oxocine vs. Oxonine — What's the Difference?

(organic compound) An unsaturated eight-membered heterocycle having seven carbon atoms, one oxygen atom and three double bonds

Oxonine is an unsaturated heterocycle of nine atoms, with an oxygen replacing a carbon at one position. Oxonine is a nonaromatic compound.

(organic compound) The unsaturated nine-membered heterocycle having eight carbon atoms, one oxygen atom and four double bonds