
1) Metamere 2) Segment
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1) Metamere
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https://www.crosswordclues.com/clue/somite

A somite is a division of the body of an animal. Somites are bilaterally paired blocks of mesoderm that form along the anterior-posterior axis of the developing embryo in segmented animals. In vertebrates, somites give rise to the vertebral bones of the spine and ribcage, (and part of the occipital bone), skeletal muscle, cartilage, tendons, and d...
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http://en.wikipedia.org/wiki/Somite

• (n.) One of the actual or ideal serial segments of which an animal, esp. an articulate or vertebrate, is is composed; somatome; metamere.
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http://thinkexist.com/dictionary/meaning/somite/

(from the article `somite`) ...neural arches of the vertebrae; the dermatome, precursor of the connective tissue of the skin; and the myotome, or primitive muscle, from which ... [3 related articles]
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http://www.britannica.com/eb/a-z/s/124

in embryology, one of a longitudinal series of blocklike segments into which the mesoderm, the middle layer of tissue, on either side of the ... [4 related articles]
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http://www.britannica.com/eb/a-z/s/124

1. <zoology> One of the actual or ideal serial segments of which an animal, especially. An articulate or vertebrate, is is composed; somatome; metamere. Somitic. ... 2. <embryology> Segmentally arranged blocks of mesoderm lying on either side of the notochord and neural tube during development of the vertebrate embryo. ... Somites are f...
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http://www.encyclo.co.uk/local/20973

(so´mīt) one of the paired segments along the neural tube of a vertebrate embryo, formed by transverse subdivision of the thickened mesoderm next to the midplane; they develop into the spinal column and muscles of the body.
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Body segment or metamere, a term usually used in reference to arthropods.
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So'mite (sō'mīt)
noun [ Greek
sw^ma body.]
(Anat. & Zoology) One of the actual or ideal serial segments of which an animal, esp. an articulate or vertebrate, is composed; somatome; metamere. --
So*mit`ic adjective Found on
http://www.encyclo.co.uk/webster/S/143

Type: Term Pronunciation: sō′mīt Definitions: 1. One of the paired, metamerically arranged cell masses formed in the early embryonic paraxial mesoderm; commencing in the third or early fourth week in the region of the hindbrain, they develop in a caudal direction typically until 42 pairs are formed. Synonyms: mesoblastic segment &.....
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http://www.medilexicon.com/medicaldictionary.php?t=82890

Greek soma = body, hence an embryonic body segment.
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https://www.encyclo.co.uk/local/21450
No exact match found.