auxospore
/ˌɒksɒˈspɔr, -spɔr/Definitions
1. noun
A type of spore that is produced by some species of diatoms, characterized by a sudden and dramatic increase in cell size.
“The auxospore of the diatom was observed under a microscope, showing its remarkable growth.”
2. noun
A spore that gives rise to a new diatom cell through a process of cell expansion and division.