(of a coat of arms or charge) adjoin (another) so that only half of each is visible. (verb) halve or reduce to the half
Maybe Leopardi’s point is that for some things, for some dimidiate things, “happiness” is plain “living”?
what
It was a spit of beach along a salina bayscape. A dimidiate moon, and stars falling darkly pacific.
so like half moon? lol