50 results for: Fetus

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Dictionary.com Unabridged (v 1.1) - Cite This Source

fe·tus

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–noun, plural -tus·es. Embryology.

(used chiefly of viviparous mammals) the young of an animal in the womb or egg, esp. in the later stages of development when the body structures are in the recognizable form of its kind, in humans after the end of the second month of gestation.

Also, especially British, foetus.

Compare embryo (def. 2).

[Origin: 1350–1400; ME < L fétus bringing forth of young, hence that which is born, offspring, young still in the womb, equiv. to fé- (v. base attested in L only in n. derivatives, as fémina woman, fécundus fecund, etc.; cf. Gk thésthai to suck, milk, OHG tāan to suck, OIr denid (he) sucks) + -tus suffix of v. action

]

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Encyclopedia Articles (31 more entries. View all »)

Columbia Electronic Encyclopedia - Cite This Source

fetus, term used to describe the unborn offspring in the uterus of vertebrate animals after the embryonic stage (see embryo). In humans, the fetal stage begins seven to eight weeks after fertilization of the egg, when the embryo assumes the basic shape of the newborn and all the organs are present. This stage continues until birth. The fetus is protected by a sac of amniotic fluid that also enables movement to occur. The placenta and umbilical cord are the sources of oxygen and nutrients and the means of waste elimination.

During the fetal stage, the body grows larger, the proportions of the features are refined, and organ development is completed. During the seventh and eighth weeks, the body grows more erect, the chest area develops, and the face begins to acquire a human look. In the third month, facial features continue to develop, nails form, ossification centers develop in bones, the sex of the unborn can be determined, and the fetus is capable of responding to outside stimulation. During the second trimester (fourth to sixth months), distinctive facial features develop, the fetal heartbeat can be detected, and fetal quickening (movements) can be felt externally. In the third trimester (the seventh to ninth months), the body proportions, except for the somewhat large head, are established, the skin becomes smoother, and the organs develop sufficiently for the newborn to function on its own.

If the fetus is expelled before 36 weeks of gestation are completed, it often can survive outside the womb, but artificial assistance, such as intravenous feedings and strict maintainance of the ambient temperature, may be needed during the remainder of its normal developmental period. Such births are called premature. Fetuses expelled before that period are not viable and are termed either a miscarriage or an abortion. A dead fetus delivered in the third trimester is termed stillborn.