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...
Permeation is the process by which a chemicaldissolves in and/or moves through a protective clothing material on a molecular level.Degradation is the loss of or change in the fabric's chemical resistance or physical properties dueto exposure to chemicals, use, or ambient conditions (e.g., sunlight).