os innominatumn.

1634 A. Read Man. Anat. Body of Man v. iii. 307 Now the bones wich are betweene the lowest vertebra of the loynes, and the thigh bone are in number three...3. Is Os coxae or innominatum. It is at the sides of os sacrum, and is framed of 3 bones os ilii, pubis, and Ischii.

1668 N. Culpeper & A. Cole tr. T. Bartholin Anat. (new ed.) iv. xvi. 351 Os Innominatum..which some term..the Flank~bone.

1753 Chambers's Cycl. Suppl. Obturator ligament, is one of the proper ligaments of the ossa innominata, and fills up the great foramen ovale.

1754–64 W. Smellie Treat. Midwifery I. 74 Each os Innominatum is in infants composed of three different bones, under the appellation of os Ilium, Ischium, and Pubis.

1811 J. Bell Anat. Human Body (ed. 3) I. vi. 108 The ossa innominata—Are the two great irregular bones, forming the sides of the pelvis which have a form so difficult to explain by one name, that they are called ossa innominata, the nameless bones.

1855 F. H. Ramsbotham Princ. & Pract. Obstetr. Med. (new Amer. ed.) 2 The os ilium, hip or haunch bone, is the largest of the 3 divisions of the os innominatum.

1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) xviii. 266 The acetabulum is so placed that the three bones making up one side of the disc meet at the bottom of the cavity. In man and in other higher forms these three bones in the adult fuse to form what is called the os innominatum.