noun. metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth.
noun. a heading of a subsection printed within the body of the text.
1. Adjective Loosen and remove the thumbscrews or crosshead screws securing the case cover to the computer. 2. Noun, singular or mass Use a crosshead screwdriver to remove the screws holding the panel in place against the trunk door.