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What (who) is rachidian$66363$ - definition
BIOLOGICAL TERM FOR AXIS OR SHAFT
Rhacis; Rachis spinal column; Rachides; Rachidian; Rhachis; Rachilla (rachis); Rachis (botany)
Rhachis
·noun The Spine.
II. Rhachis ·noun A central cord of the ovary of nematodes.
III. Rhachis ·noun The central cord in the stem of a crinoid.
IV. Rhachis ·noun The median part of the radula of a mollusk.
V. Rhachis ·noun The principal axis in a raceme, spike, panicle, or corymb.
VI. Rhachis ·noun The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern.
VII. Rhachis ·noun The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.
Rachidian
·adj Of or pertaining to the rachis; spinal; vertebral. ·same·as Rhachidian.
rachis
['re?k?s]
(also rhachis)
¦ noun (plural rachides -k?di:z)
1. Botany a stem of a grass or other plant bearing flower stalks at short intervals.
the midrib of a compound leaf or frond.
2. Anatomy the vertebral column, or the cord from which it develops.
3. Ornithology the shaft of a feather.
Origin
C18: mod. L., from Gk rhakhis 'spine'; the Engl. plural -ides is by false analogy.
Wikipedia
Rachis
In biology, a rachis (from the Ancient Greek: ῥάχις [rhákhis], "backbone, spine") is a main axis or "shaft".
