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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
  • 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
  • What Is a Fetus? Definition and Fetal Development
    A fetus is the term for a developing human from the ninth week of pregnancy until birth Before that point, the developing organism is called an embryo
  • 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
  • Fetal Development - UF Health
    Learn how your baby is conceived and how your baby develops inside the mother's womb Zygote; Blastocyst; Embryo; Fetus 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
  • The Stages of Fetal Development - Human Life International
    There are two ways to measure what stage of development a baby is in: fertilization age and gestational age These terms can be somewhat confusing since they are based upon different starting points Fertilization age is calculated from the date of conception onwards
  • Understanding the 3 Prenatal Development Stages - Verywell Mind
    Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus The fetal period of prenatal development marks more important changes in the brain
  • Embryo vs. Fetus: How to Tell Them Apart - Verywell Health
    The terms "embryo" and "fetus" describe distinct phases of pregnancy An embryo is present from week five to week 10, after which the developing baby is referred to as a fetus until birth





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