yolk sac
معنی فارسی
(جنين شناسي) کيسه زرده دورتادور جنين.
معنی کامل و مثالها
● (به ویژه در رویان حشره و پرنده و ماهی) کیسهی زرده
ریشه و کاربرد
ریشه
From Middle English yolke, from Old English geolca, from Proto-Germanic *jelką.
مثال
- The yolk sac provides nourishment to the developing embryo.
- In some species, the yolk sac is absorbed into the body before birth.
- The yolk sac is visible in the early stages of embryonic development.
ترکیبهای رایج
Yolk sac tumor Yolk sac carcinoma Yolk sac development
تعریف انگلیسی
noun
- membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
- membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo