micronova
A stellar outburst about one millionth the strength of a classical nova.
The pressure eventually overcomes the outer shell, erupting in a micronova.
Where it comes from
Coined by the Douglas Vogt of the Diehold Foundation, later used by Ben Davidson in a similar sense, but since 2022 used in a scientific context to refer to an entirely different phenomenon than the speculative and unscientific one of Vogt and Davidson. From micro- + nova.
Adapted from the Wiktionary entry micronova (CC BY-SA 4.0).