They are sucked up by two cupping vessels, ( "cotyloid".    From Wordnik.com.  [Autocrat of the Breakfast Table] Reference

The deep cotyloid cavity renders disarticulation difficult and luxation does not often take place.    From Wordnik.com.  [Lameness of the Horse Veterinary Practitioners' Series, No. 1] Reference

The femeropelvic articulation is formed by the hemispherical head of the femur and the acetabulum; the latter constituting a cotyloid cavity which is deepened by the cotyloid ligament.    From Wordnik.com.  [Lameness of the Horse Veterinary Practitioners' Series, No. 1] Reference

Another ligament, peculiar to Equidae -- the accessory (pubiofemoral) -- is attached to the head of the femur near the round ligament and passes through the cotyloid notch and along the under side of the pubis.    From Wordnik.com.  [Lameness of the Horse Veterinary Practitioners' Series, No. 1] Reference

It should be particularly known that the union of all bones is, for the most part, by a head and socket (cotyle); in some of these the place (socket?) is cotyloid and oblong, and in some the socket is glenoid (shallow?).    From Wordnik.com.  [On The Articulations] Reference

I am inclined to ascribe this to the different anatomical arrangement of the two joints, particularly to the fact that the head of the femur is included in a bony cup, into the hollow of which it is accurately fixed by the resilient cotyloid fibro-cartilage.    From Wordnik.com.  [Surgical Experiences in South Africa, 1899-1900 Being Mainly a Clinical Study of the Nature and Effects of Injuries Produced by Bullets of Small Calibre] Reference

The Glenoidal Labrum (labrum glenoidale; cotyloid ligament).    From Wordnik.com.  [III. Syndesmology. 7. Articulations of the Lower Extremity. a. Coxal Articulation or Hip-joint] Reference

The cotyloid ligament being broader and thicker than usual, makes the osseous portion of the socket appear deeper than it really is.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

The edge of the acetabulum is specially strong above and behind, while at its lower margin there is a gap, bridged over by the labrum glenoidale (cotyloid ligament).    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

It is bounded by a prominent uneven rim, which is thick and strong above, and serves for the attachment of the glenoidal labrum (cotyloid ligament), which contracts its orifice, and deepens the surface for articulation.    From Wordnik.com.  [II. Osteology. 6c. The Bones of the Lower Extremity. 1. The Hip Bone] Reference

It consist in the rabbit of four bones; the ilium (i.), the ischium (is.), the pubis (pb.), and the small cotyloid bone -- the first two and the latter one meeting in the acetabular fossa (ac.) in which the head of the femur works.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

That their thighs, continually embracing both the trunks and the larger branches of trees, would contract a condition of habitual separation which would tend to widen the pelvis and to cause the cotyloid cavities to be directed backward.    From Wordnik.com.  [Lamarck, the Founder of Evolution His Life and Work] Reference

Other fractures may be followed by complete disability of the patient, as, for example, when the cotyloid cavity is involved, or when the reparatory process has left bony deposits in the pelvic cavity at the seat of the union, which may, in the case of the female, interfere with the steps of parturition, or induce some local paralysis by pressure upon the nerves which govern the muscles of the hind legs.    From Wordnik.com.  [Special Report on Diseases of the Horse] Reference

The Acetabulum (cotyloid cavity).    From Wordnik.com.  [II. Osteology. 6c. The Bones of the Lower Extremity. 1. The Hip Bone] Reference

Ligament, cotyloid, 185.    From Wordnik.com.  [Lameness of the Horse Veterinary Practitioners' Series, No. 1] Reference