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Nephridium :: Nephridium (n.) A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ. See Illust. under Loeven's larva.

Segment :: Segment (n.) One of the divisions, rings, or joints into which many animal bodies are divided; a somite; a metamere; a somatome..

Protozoonite :: Protozoonite (n.) One of the primary, or first-formed, segments of an embryonic arthropod..

Mesencephalon :: Mesencephalon (n.) The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain.

Segment :: Segment (n.) One of the parts into which any body naturally separates or is divided; a part divided or cut off; a section; a portion; as, a segment of an orange; a segment of a compound or divided leaf..

Segmental :: Segmental (a.) Relating to, or being, a segment..

Rhodophane :: Rhodophane (n.) The red pigment contained in the inner segments of the cones of the retina in animals. See Chromophane.

Hyomandibular :: Hyomandibular (a.) Pertaining both to the hyoidean arch and the mandible or lower jaw; as, the hyomandibular bone or cartilage, a segment of the hyoid arch which connects the lower jaw with the skull in fishes..

Fission :: Fission (n.) A method of asexual reproduction among the lowest (unicellular) organisms by means of a process of self-division, consisting of gradual division or cleavage of the into two parts, each of which then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ, undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division, under Division..

Division :: Division (n.) The portion separated by the divining of a mass or body; a distinct segment or section.

Strobila :: Strobila (n.) A form of the larva of certain Discophora in a state of development succeeding the scyphistoma. The body of the strobila becomes elongated, and subdivides transversely into a series of lobate segments which eventually become ephyrae, or young medusae..

Protomerite :: Protomerite (n.) The second segment of one of the Gregarinae.

Uromere :: Uromere (n.) Any one of the abdominal segments of an arthropod.

Welwitschia :: Welwitschia (n.) An African plant (Welwitschia mirabilis) belonging to the order Gnetaceae. It consists of a short, woody, topshaped stem, and never more than two leaves, which are the cotyledons enormously developed, and at length split into diverging segments..

Tubicolae :: Tubicolae (n. pl.) A division of annelids including those which construct, and habitually live in, tubes. The head or anterior segments usually bear gills and cirri. Called also Sedentaria, and Capitibranchiata. See Serpula, and Sabella..

Clitellus :: Clitellus (n.) A thickened glandular portion of the body of the adult earthworm, consisting of several united segments modified for reproductive purposes..

Article :: Article (n.) One of the segments of an articulated appendage.

Metathorax :: Metathorax (n.) The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.

Merismatic :: Merismatic (a.) Dividing into cells or segments; characterized by separation into two or more parts or sections by the formation of internal partitions; as, merismatic growth, where one cell divides into many..

Manubrium :: Manubrium (n.) A handlelike process or part; esp., the anterior segment of the sternum, or presternum, and the handlelike process of the malleus..

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