animal pole

noun

Biology.

1. the formative part of an ovum, having the greatest amount of cytoplasm and containing the nucleus.

Word History and Origins

Origin of animal pole¹

First recorded in 1885–90

Example Sentences

The yolk is pale green, and the animal pole is brown.

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All the eggs are viewed from the animal pole.

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The diagrams show the positions of the segmentation spheres and of the contained nuclei as seen from the animal pole.

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After the ovum has finished its growth, and elaborated the yolk within itself, a peculiar change occurs in the small area free from yolk-- the animal pole, in which the germinal vesicle lies.

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A furrow cutting deeper and deeper divides it into two; another follows at right angles to this, making the two four, and another equatorial furrow cuts off the animal pole from the yolk or vegetative pole.

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