different between ephemeric vs ephemeron

English

ephemeric (comparative more ephemeric, superlative most ephemeric)

Borrowed from Ancient Greek ???????? (eph?meron), neuter form of ???????? (eph?meros)

ephemeron (plural ephemera)

Something short-lived or transitory.
(programming) A type of weak reference in a garbage collected programming language that does not permit an object to be kept alive by its finalizer.
- 2020, KC Sivaramakrishnan et al., "Retrofitting Parallelism onto OCaml"[1]:
  Beyond type safety, OCaml has several features that closely interact with the garbage collector. These include weak references, finalisers, ephemerons, and lazy values, whose semantics will have to be preserved with the new GC so as to not break programs that use those features.

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