In mammals with ovaries, that would be an unfertilized ovum (egg). Ova (more than one ovum) are created one time by the hundreds in the ovaries, and one is released per month, later to leave the body if it is not fertilized (until the age of menopause).
ovaries release an egg each month
Yes; that's what happens in a woman with one ovary.
Yes. That's the usual way of things, however there are times when both ovaries give up an egg. This is the origin of fraternal twins. Sometimes neither ovary produces, just take a month off. Under the influence of fertility drugs as much as a dozen eggs can be produced in a given month.
The ovary. Women are born with all the eggs they will ever have. The ovary stores them and at intervals will stimulate and egg to develop.
ovum
An egg typically leaves the ovary once a month during ovulation in adult women.
one
leave
If it is a normal ovary, and the human has normal cycles, it will ovulate every month.
when mature egg cells leave the ovary
Women have Ovaries , they are very important in pregnancy. This is one of many examples for sentence use.
Ovulation is the time of the month when a women discharges an ova or ovules from the ovary.