A (usually) metal fastener consisting of a cylindrical body that is threaded, with a larger head on one end. It can be inserted into an unthreaded hole up to the head, with a nut then threaded on t...

plural of summer school

(uncountable) A materials science that studies applications of origami folding to thicker materials (other than the traditional thin sheets of paper)

Any of the genus Anableps of four-eyed fishes (having eyes raised above the top of the head and divided into two parts) found in brackish waters in northern South America and Trinidad.