Too small to be seen with an ordinary microscope. / (not comparable) Of or relating to ultramicroscopy.

A town in Luxembourg, in the commune of Differdange, in the canton of Esch-sur-Alzette.

(organic chemistry) The adenyl derivative of succinic acid 2-[[9-[3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]purin-6-yl]amino]butanedioic acid that plays a part in nucleotide metabolism.

(mathematics) A group of isometries leaving a fixed point.