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fetus    音标拼音: [f'itəs]
n. 胎儿

胎儿

fetus
n 1: an unborn or unhatched vertebrate in the later stages of
development showing the main recognizable features of the
mature animal [synonym: {fetus}, {foetus}]

Fetus \Fe"tus\ (f[=e]"t[u^]s), n.; pl. {Fetuses}
(f[=e]"t[u^]s*[e^]z). [L. fetus, foetus, a bringing forth,
brood, offspring, young ones, cf. fetus fruitful, fructified,
that is or was filled with young; akin to E. fawn a deer,
fecundity, felicity, feminine, female, and prob. to do, or
according to others, to be.]
The young or embryo of a vertebrate animal in the womb, or in
the egg; often restricted to the later stages in the
development of viviparous and oviparous animals. showing the
main recognizable features of the mature animal, {embryo}
being applied to the earlier stages. [Written also
{f[oe]tus}.]
[1913 Webster]


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  • Fetus - Wikipedia
    In human prenatal development, fetal development begins from the ninth week after fertilization (which is the eleventh week of gestational age) and continues until the birth of a newborn
  • Fetal development by week: Your baby in the womb | BabyCenter
    Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images At the start of this week, you ovulate Your egg is fertilized 12 to 24 hours later if a sperm penetrates it
  • Fetal Development: Week-by-Week Stages of Pregnancy
    Fetal development is how a fetus grows during pregnancy It begins at conception and ends at birth Many changes occur to the fetus and the pregnant person in this time
  • Is a Fetus Part of the Mother’s Body? What Science Says
    A fetus develops inside the mother’s body but is not, biologically speaking, part of it From the moment of fertilization, a fetus carries its own unique genome, maintains a separate circulatory system, and is physically walled off from the mother’s tissues by a multi-layered placental membrane The relationship is closer to a hosted organism than an integrated organ, though the biological
  • Stages of Fetal Development - The Merck Manuals
    By 12 weeks of pregnancy: The fetus fills the entire uterine cavity As the pregnancy continues, the uterus enlarges as the fetus grows By about 14 weeks: The sex can be identified on ultrasound By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving
  • How a Human Embryo Develops into a Fetus | Britannica
    In humans the embryo begins to develop about four days after an egg is fertilized Appearing initially as a tiny mass of cells, it eventually gives rise to the fetus, an obvious human form In the first days of the embryo’s existence, it journeys along the fallopian tube
  • FETUS Definition Meaning - Merriam-Webster
    The meaning of FETUS is an unborn or unhatched vertebrate especially after attaining the basic structural plan of its kind; specifically : a developing human from usually two months after conception to birth
  • Embryo vs. Fetus: What’s the Difference? - Healthline
    In human pregnancies, a baby-to-be isn’t considered a fetus until the 9th week after conception, or week 11 after your last menstrual period (LMP) The embryonic period is all about the formation
  • Fetal development: The first trimester - Mayo Clinic
    At the 11th week of pregnancy, or the ninth week after conception, your baby now is called a fetus At this point in pregnancy, the face is broad, the eyes widely separated, the eyelids fused, and the ears are set low on the side of the head
  • Fetal development: MedlinePlus Medical Encyclopedia
    Learn how your baby is conceived and how your baby develops inside the mother's womb WEEK BY WEEK CHANGES Gestation is the period of time between conception and birth when a baby grows and develops inside the mother's womb





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