a. Anat. Also 8 sphænoidal, 8–9 sphenoïdal. [ad. mod.L. sphēnoidālis († sphæn-), f. sphēnoidēs SPHENOID. So F. sphénoïdal (18th cent.).]

1

  1.  Sphenoidal bone, the sphenoid bone.

2

1726.  Monro, Anat., 88. It is connected to the sphenoidal Bone, by means of that same Suture.

3

1746.  Phil. Trans., XLIV. 11. The Hole of the sphænoidal Bone, thro’ which the Optic Nerve passes.

4

1834.  H. M’Murtrie, Cuvier’s Anim. Kingd., 173. A narrow canal which traverses the palatine and sphenoidal bones.

5

  2.  Of or pertaining to, connected with, the sphenoid bone.

6

  Chiefly in a number of special collocations, as sphenoidal angle, fissure, sinus, suture, etc.

7

1726.  Monro, Anat., 88. The sphenoidal Suture connects it to the Wedge-like Bone.

8

1728.  Chambers, Cycl., Sphenoidal Suture, in Anatomy, a Suture thus call’d from its encompassing the Os sphenoides.

9

1808.  Barclay, Muscular Motions, 505. The frontal, sphenoidal, and maxillary antres.

10

1822.  J. Parkinson, Outl. Oryctol., 284. The sphenoidal plates which form a vault over the palate bones.

11

1854.  R. Owen, in Orr’s Circ. Sci., Org. Nature, I. 167. Such cells are called … ‘sphenoidal’ and ‘ethmoidal sinuses’ in man.

12

1872.  Mivart, Anat., 83. A long but narrow space, termed the sphenoidal fissure.

13