| 释义 |
Definition of yolk sac in English: yolk sacnoun Zoology 1A membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae of some fishes. Example sentencesExamples - Likewise, the occasional yolk sac tumor arising in liver has been reported in childhood.
- The eggs take about 20 weeks to hatch and the now free-swimming ray is still reliant upon its yolk sac for a few more weeks before it begins to feed upon shrimps.
- As young, begin to feed on attached yolk sacs, then plankton.
- Unlike salmon, cod fry have no yolk sac on which to survive.
- The neoplasm metastasized as the yolk sac component.
- 1.1 A sac lacking yolk in the early embryo of a mammal.
Definition of yolk sac in US English: yolk sacnoun Zoology 1A membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae of some fishes. Example sentencesExamples - The eggs take about 20 weeks to hatch and the now free-swimming ray is still reliant upon its yolk sac for a few more weeks before it begins to feed upon shrimps.
- Likewise, the occasional yolk sac tumor arising in liver has been reported in childhood.
- Unlike salmon, cod fry have no yolk sac on which to survive.
- The neoplasm metastasized as the yolk sac component.
- As young, begin to feed on attached yolk sacs, then plankton.
- 1.1 A sac lacking yolk in the early embryo of a mammal.
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