Definition of parasexual in US English:

parasexual

adjective

  • 1Genetics. Designating any form of genetic recombination that occurs by a process other than the fusion of gametes, as (in certain fungi) by the fusion of nuclei, (in bacteria) by conjugation, transduction, or transformation, or (in viruses) by exchange of genes within a host cell.

  • 2Having sexual aspects but not involving full sexual relations.

Origin

1950s. From para- + sexual [noun].