parasperm

parasperm (plural parasperm)

1. (zoology) In species that exhibit sperm heteromorphism, infertile sperm.
   • 2009, Judith Goodenough, Perspectives on Animal Behavior, page 316:

     First, it is possible that parasperm have no adaptive function. Most consider this unlikely given the large number of parasperm produced (parasperm may make up half of an ejaculate) and the presumed costs of their production.

• eusperm