truncate

Something traumatic causes a person to truncate himself or herself in that way.

This seems to have been the form present to Rostafinski when he wrote "columella truncate."

The upper margin of the cephalothorax is not rounded, but truncate.

Front margin truncate, sides almost straight, lower margin slightly convex, smooth and shiny and provided with many short hairs.

Upper edge almost truncate, yet rounded; sides evenly convex, lower edge almost straight.

Valve convex on dorsal side, apices dilated and truncate; stri distant at centre.