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...
Perlite. 1  Material and Description Is a silica-based volcanic rock that has been heated using natural gas, causing it to expand and become less dense. 2  Characteristics Perlite is sterile and has a neutral pH. 3  Common Usage Typically makes up 30â50% of mixes when combined with peat or high C:N compost.