• WordNet 3.6
    • n ischium one of the three sections of the hipbone; situated below the ilium
    • ***
Webster's Revised Unabridged Dictionary
    • Ischium (Zoöl) One of the pleuræ of insects.
    • Ischium (Anat) The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.
    • ***
Century Dictionary and Cyclopedia
    • n ischium In anatomy, the posterior part of the pelvic arch in vertebrates, the lowermost of the three parts forming the os innominatum. It is the posterior one of two divisions of the distal part of the primitive cartilaginous rod, subsequently expanded and variously modified in shape, and normally ankylosed at the acetabulum with both ilium and pubis to form the osinnominatum, with or without additional union with the other pelvic bones. It is sometimes united with its fellow of the opposite side, or with vertebræ. In man it forms the lowermost part of the haunch-bone, on which the body rests in a sitting position. See cuts under Dromæus, innominatum, and Ichthyosauria.
    • n ischium In Crustacea, the third joint of the normally 7-jointed leg; the ischiopodite.
    • ***
Chambers's Twentieth Century Dictionary
    • Ischium the posterior part of the pelvic arch in vertebrates
    • ***


Webster's Revised Unabridged Dictionary
L., Gr. 'ischi`on
Chambers's Twentieth Century Dictionary
L.,—Gr., from is-chion, the hip-joint.


In literature:

In the pelvic girdle the ilium corresponds to the scapula, the ischium to the coracoid, the pubis to the clavicle.
"Form and Function" by E. S. (Edward Stuart) Russell
The spine of the ischium.
"Surgical Anatomy" by Joseph Maclise
In one Bantam this bone extended very little beyond the extremity of the ischium.
"The Variation of Animals and Plants Under Domestication, Vol. I." by Charles Darwin
Fracture of the posterior parts of the bone (ischium), which forms the point of the buttocks occasionally occurs.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture
The area of origin extends to the posterior edge of the ischium.
"Myology and Serology of the Avian Family Fringillidae" by William B. Stallcup
Ilium; Is, ischium; Pb, pubis; d.l, dorso-lumbar vertebrae; Cd, caudal vertebrae; Am, acetabulum.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
The pubis is slender, and the ischium is elevated and robust.
"Neotropical Hylid Frogs, Genus Smilisca" by William E. Duellman
The posterior and external angle of the ischium is rough and prominent; it is the tuberosity of the ischium.
"Artistic Anatomy of Animals" by Édouard Cuyer
The right buttock was swollen from inflammation, and a large, deep-seated abscess formed near the tuberosity of the ischium.
"A System of Practical Medicine by American Authors, Vol. I" by Various
The pelvis is greatly attached by the ischium to the vertebral column.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard