Definition
noun
The absence of any ejaculate or semen.
Supplement
One of its causes is retrograde ejaculation by excessive drug use.
Word origin: a-, without + –spermia.
Compare: oligospermia, polyspermia.
See also: azoospermia.
Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..
Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..
This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..
Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..
This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..
There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..