Occasionally accessory bones are found in the carpus, but of more than 20 such described bones, only four (the central, styloid, secondary trapezoid, and secondary pisiform bones) are considered to be proven accessory bones. Sometimes the scaphoid, triquetrum, and pisiform bones are divided into two.
perforce definition: by or through necessity; necessarilyOrigin of perforceMiddle English par force from OFr: see per and force...
Permeance is defined to be the gas flow rate through the material, per unit of area and per unit of pressure difference across the material. The unit is equal to 10 4 barrer per centimeter, or 10-6 cmÂ·s-1 Â·cmHg-1, or, in SI units, 7.5005 x 10-16 mÂ·s-1 Â·Pa-1. gauge (ga) [1] a traditional unit measuring the interior diameter of a shotgun barrel.