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e of the lateral axes. -- Cell cleavage (Biol.), multiplication of cells by fission. See Segmentation. -- Cubuc cleavage, cleavage parallel to the faces of a cube. -- Diagonal cleavage, cleavage parallel to ta diagonal plane. -- Egg clavage. (Biol.) See Segmentation. -- Lateral cleavage, cleavage parallel to the l…

ckened glandular portion of the body of the adult earthworm, consisting of several united segments modified for reproductive purposes.

To render coneshaped; to bevel like the circular segment of a cone; as, to cone the tires of car wheels.

The apex of the last abdominal segment of an insect.

An order of myriapods having two pairs of legs on each segment; the Chilognatha.

The portion separated by the divining of a mass or body; a distinct segment or section. Communities and divisions of men. Addison.

toderm and ectoderm; as, the "ectental line" or line of juncture of the two layers in the segmentation of the ovum. C. S. Minot.

Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova.

The more transparent cells, which finally become external, in many segmenting ova, as those of mammals.

ll, until finally the original cell wall is ruptured and the new cells are liberated (see Segmentation, and Illust. of Cell Division, under Division). This mode of growth is characteristic of many forms of cells, both animal and vegetable.

The ninth segment in insects.

The more granular cells, which finally become internal, in many segmenting ova, as those of mammals.

The segment of the brain next behind the midbrain, including the cerebellum and pons; the hindbrain. Sometimes abbreviated to epen.

Pertaining to the segment between the ceratobranchial and pharyngobranchial in a branchial arch. -- n.

A segment next above the ceratohyal in the hyoidean arch.

One of the segments of the transverse axis, or the so called homonymous parts; as, for example, one of the several segments of the extremities in vertebrates, or one of the similar segments in plants, such as the segments of a segmented leaf. Syd. Soc. Lex.

Pertaining to the segments above the epibranchial in the branchial arches of fishes. -- n.

nd; an extreme flat forth. Extreme and mean ratio (Geom.), the relation of a line and its segments when the line is so divided that the whole is to the greater segment is to the less. -- Extreme distance. (Paint.) See Distance., n., 6. -- Extreme unction. See under Unction.

The exterior wooden rim, or a segment of the rim, of a wheel, supported by the spokes. [Written also felloe.] Break all the spokes and fellies from her wheel. Shak.

The proximal segment of the hind limb containing the thigh bone; the thigh. See Coxa.