A surname from German.

(mineralogy) A hard stone, such as the cat's-eye, which presents on a polished surface, and in the interior, an undulating or wavy light.

(mechanics) A polygonal figure the sides of which are vectors representing several forces acting simultaneously upon one point, so that the vector necessary to make the figure closed is the resulta...

(organic chemistry) Either of two isomeric phenols derived from naphthalene; they are used in the preparation of dyes and many other compounds