| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| Adrian IV | |
| —n | |
| original name Nicholas Breakspear. ?1100--59, the only English pope (1154--59) | |
Adrian A·dri·an (ā'drē-ən), Edgar Douglas. First Baron Adrian. 1889-1977.
British physiologist. He shared a 1932 Nobel Prize for major advances in the understanding of the nervous and muscular systems and was one of the first to study electrical activity in the brain and nervous system.