yolk

名词 yolk:

1. the yellow spherical part of an egg that is surrounded by the albumen
   同义词：egg yolk
2. nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)
   同义词：vitellus

1. The egg has a double yolk.
   这只蛋双黄。
2. One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell.
   卵黄系带鸡蛋内将蛋黄和蛋壳任一端的内膜连接的两个螺旋的带状组织之一
3. The yolk is the yellow part in an egg.
   蛋黄是鸡蛋中的黄色部分。

yolk

n.（名词）

The yellow, usually spherical portion of an egg of a bird or reptile, surrounded by the albumen and serving as nutriment for the developing young.
蛋黄：鸟类或爬行动物蛋内的黄色的、通常是球形的部分，回周包有蛋白，作为哺育幼鸟（仔）的营养物
A corresponding portion of the egg of other animals, consisting of protein and fat which serve as the primary source of nourishment for the early embryo and protoplasmic substances from which the embryo develops.
卵黄：其它动物蛋内的相应部分，由蛋白质和脂肪组成，用作早期胚胎的主要营养来源和胚胎由此发育的原生物质
A greasy substance found in unprocessed sheep`s wool.
羊毛油脂：未加工羊毛中的油腻物质

来源：
Middle English yolke
中古英语 yolke
from Old English geolca
源自 古英语 geolca
from geolu [yellow] * see yellow
源自 geolu [黄色的] *参见 yellow

【引伸】
yolk.y
adj.（形容词）