Term: oospore: a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi
Broader: spore: a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion | Unrelated: lumen: a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions