rachidianadj.n.
/rəˈkɪdɪən/, U.S. /rəˈkɪdiən/ A. adj.
1. Anatomy. Of or relating to the spine; spinal; vertebral.
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the world > life > the body > structural parts > bone or bones > spine > [adjective]
chined1577
vertebral1681
spinal1725
spinous1807
rachidian1823
rachidial1834
rachial1848
sterno-vertebral1861
juxta-spinal1876
thoracispinal1887
1823 Lancet 28 Dec. 446/1 The veins of the brain, and of the rachidian prolongation were filled with red liquid blood.
1836 R. W. Haxall in Libr. Pract. Med. VII. 154 The form of disease now under consideration may be due to an irritation of the rachidian column.
1902 Lancet 27 Sept. 887/1 On opening the rachidian canal there was frequently observed meningeal congestion.
1972 Amer. Jrnl. Surg. 124 355/1 Associated factors explaining the patient's critical condition, such as craniocerebral, rachidian, or medullary lesions, thoracic wounds, or multiple fractures.
2006 Joint Bone Spine 73 286/2 The tomodensitometry (TDM) and the magnetic resonance imaging (MRI) found narrowness of the cervical rachidian channel.
2. Zoology. In a gastropod mollusc: designating or relating to any of the median row of teeth of the radula.
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the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > inflorescence or collective flower > [adjective] > of axis
rachidian1880
1848 Proc. Zool. Soc. 140 The Rachidian development..is the longest, and forms the Rachial type.
1851 S. P. Woodward Man. Mollusca i. 27 The rachidian teeth sometimes form a single series.
1880 Jrnl. Linn. Soc. 15 167 If the rhachidian series is suppressed.
1950 R. W. Miner Field Bk. Seashore Life xi. 644 The radula is narrow, and either has a single lateral on either side of the median, or rachidian, tooth, or there is a lateral on either side with the median tooth lacking.
1990 Jrnl. Molluscan Stud. 56 585 The rachidian tooth usually has four denticles on each side.
B. n.
Zoology. A rachidian tooth of a gastropod mollusc.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Mollusca > [noun] > mollusc or shell-fish > parts of mollusc
ungulaa1382
mantlea1475
trunk1661
diaphragm1665
lid1681
operculum1681
ear1688
beard1697
corslet1753
scar1793
opercle1808
pleura1826
pallium1834
byssus1835
cephalic ganglia1835–6
opercule1836
lingual ribbon1839
tube1839
cloak1842
test1842
collar1847
testa1847
rachis1851
uncinus1851
land-shell1853
mantle cavity1853
mesopodium1853
propodium1853
radula1853
malacology1854
gill comb1861
pallial cavity1862
tongue-tootha1877
mesopode1877
odontophore1877
pallial chamber1877
shell-gland1877
rasp1879
protopodium1880
ctenidium1883
osphradium1883
shell-sac1883
tooth-ribbon1883
megalaesthete1885
rachidian1900
scungille1953
tentacle-sheath-
1900 Science 30 Nov. 824/2 The single rhachidian of Volutomitra is well figured by Stimpson.
1948 Jrnl. Parasitol. 34 381 Variations in the upper edge of the rachidians.
1990 Jrnl. Zool. 222 485 The rachidian is well developed.
This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).
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adj.n.1823