( embryology) the repeated division of a fertilised ovum

the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart

The act or process of dividing into segments; specifically ( Biol.), a self- division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation.

1. Dividing into segments; the state of being divided into segments. 2. The process of development of the impregnated ovum.

Process of dividing into segments.

A dividing into segments.

A dividing or splitting into segments.

The division or splitting into segments or portions ; cleavage of an ovum.

We have the old argument from embryonic transformism brought forward without any hint that later investigation tends to show differentiation further and further back, prior to segmentation and, according to some, in the very protoplasm itself. – The Faith of the Millions (2nd series) by George Tyrrell

The mechanism of the origin of twins, as the result of altering the composition of the sea- water, is revealed by observation of the first segmentation of the egg in these solutions. – Darwin and Modern Science by A.C. Seward and Others

This operation will necessarily determine slow movements of diffusion in the egg, which will give rise to segmentation. – The Mechanism of Life by Stéphane Leduc

It expresses one of the prime characteristics of this class of animals, namely, that of segmentation. – Directions for Collecting and Preserving Insects by C. V. Riley

According to the tradition among the Senecas, the bear and the deer were the two original gentes, from which the others were formed by segmentation. – The Origin of the Family Private Property and the State by Frederick Engels

Professor Morgan found that if he destroyed half of a frog's egg after the first segmentation, the remaining half gave rise to half an embryo, but that if he put the half- egg upside down, and compressed it between two glass plates, he got a perfect embryo frog of half the normal size. – The Breath of Life by John Burroughs

The contents of the cells have undergone segmentation. – The Mechanism of Life by Stéphane Leduc

In America, the formation of new tribes and dialects by segmentation was in progress until quite recently, and doubtless it is still going on. – The Origin of the Family Private Property and the State by Frederick Engels

Out of this agitation arises a little spot, that is usually round, and enlarges progressively to reach a maximum, after which it diminishes, with frequent segmentation and shrinkage. – Astronomy for Amateurs by Camille Flammarion

The segmentation is plainly visible. – The Glow-Worm and Other Beetles by Jean Henri Fabre

Whether the gametocytes are distinguishable at an early stage in the segmentation of the ovum, or only at a later stage of development, we know that the gametes ultimately formed have descended by a series of cell- divisions from the fertilised ovum or zygote cell from which development commenced. – Hormones and Heredity by J. T. Cunningham

Some people never learn, Mendax thought as he booted the admin off again with another error message: Segmentation violation. – Underground by Suelette Dreyfus

There is always, to begin with, an egg, having the same essential structure as that of the dog; the yolk of that egg always undergoes division, or segmentation, as it is often called; the ultimate products of that segmentation constitute the building materials for the body of the young animal; and this is built up round a primitive groove, in the floor of which a notochord is developed. – Thomas Henry Huxley; A Sketch Of His Life And Work by P. Chalmers Mitchell

Much of this flow is seen to be directed into the arms along the channels determined by the segmentation of the annular rim. – The Splash of a Drop by A. M. Worthington

It may be pointed out that segmentation in the insect egg is peculiar. – Hormones and Heredity by J. T. Cunningham