Fetus (noun)

1. An unborn human or animal in the later stages of development, after it has developed all its major body organs.
2. The unborn offspring from the end of the eighth week after conception to the moment of birth.

Origin:

Fetus (n) late 16th century: from latin foetus, literally "offspring", from foedus "offspring".

Examples:

1. The fetus begins to move during the second trimester of pregnancy.
2. The fetus is protected by the amniotic fluid in the womb.
3. The fetus weighs about three pounds at full term.
4. Medical advances have made it possible to detect certain disorders in the fetus.
5. The fetus requires a constant supply of oxygen from the mother through the placenta.