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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
    A fetus or foetus ( ˈfiːtəs ; pl : fetuses, foetuses, rarely feti or foeti) is the unborn offspring of a viviparous animal that develops from an embryo [1] Following the embryonic stage, the fetal stage of development takes place Prenatal development is a continuum, with no clear defining feature distinguishing an embryo from a fetus
  • 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: 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
  • What is the difference between an embryo, a fetus, and a baby? - Clue
    When egg and sperm meet, a zygote is formed and quickly begins dividing to become an embryo As pregnancy progresses, the embryo becomes a fetus The fetus becomes a neonate or newborn at birth
  • Fetus Definition and Examples - Biology Online Dictionary
    A fetus is a developing human organism in the womb from the 9th week of gestation until birth
  • 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: The Complete Week-by-Week Guide (2025)
    Track your baby's growth with our week-by-week fetal development guide, featuring medical illustrations and key milestones from conception to birth
  • Embryo vs. Fetus: How to Tell Them Apart - Verywell Health
    Both embryo and fetus are terms used to describe the stages of a baby’s development during pregnancy Gestational age or the length of time a person is pregnant is the main difference between an embryo and a fetus
  • 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





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