megaspore: larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte
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
extropy: the prediction that human intelligence and technology will enable life to expand in an orderly way throughout the entire universe