单词	ovum
释义	ovum noun ˈō-vəm  plural ova ˈō-və  : a female gamete : macrogamete called also egg cell Example Sentences Recent Examples on the Web The menstrual cycle is usually 28 days and is divided in half by ovulation on day 14, as the ovum is released from the ovary. Jason Karp, Outside Online, 14 Mar. 2014 Afterward, odds are fair that an ovum of the bottom lizard will set out on its parthenogenic way. Rebecca Coffey, Forbes, 8 Nov. 2021 The right chemical stimulus can cause a mammalian ovum in a lab, even a human one, to start dividing and producing an embryo without sperm. Quanta Magazine, 18 June 2020 Each ovum has its own characteristics and personality, but the woman is young, not necessarily in a forever-relationship and just not ready for a baby of her own. Christine Dolen, sun-sentinel.com, 15 July 2019 Pregnancy occurs when a sperm cell fertilizes an ovum that has been released into the Fallopian tubes after ovulation. Shan Boodram, Teen Vogue, 19 July 2018 This is the part of the sperm that produces an enzyme that breaks down the outer edge of the ovum, enabling pregnancy. Joe Pappalardo, Popular Mechanics, 16 July 2018 In more 80 percent of the 41 fertilized ovums tested, the growing and dividing cells failed to form a hollow sphere of about 200 cells, called a blastocyst. Marissa Fessenden, Smithsonian, 21 Sep. 2017 If there exists a Platonic ideal of a bird egg, an ovum shaped most like all the others, it is not laid by a chicken but by a small warbler called the graceful prinia. Ben Guarino, sacbee.com, 22 June 2017 See More Word History Etymology New Latin, from Latin, egg — more at egg entry 1 First Known Use 1672, in the meaning defined above Kids Definition ovum noun ˈō-vəm  plural ova ˈō-və : egg cell Medical Definition ovum noun ˈō-vəm  plural ova -və  : a female gamete : macrogamete especially : a mature egg that has undergone reduction, is ready for fertilization, and takes the form of a relatively large inactive gamete providing a comparatively great amount of reserve material and contributing most of the cytoplasm of the zygote
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