(mineralogy) A monoclinic-prismatic mineral containing calcium, hydrogen, manganese, oxygen, and phosphorus.

(UK, obsolete) A bold, stout robber, or night thief.

plural of Robertsman

Of or relating to William Rees Brebner Robertson (1881–1941), American zoologist and early cytogeneticist who first discovered the Robertsonian translocation.

The phenomenon whereby genetic recombination allows evolution to progress more quickly.

(pathology) A bilateral small pupil of the eye that reduces in size when the patient focuses on a near object but does not constrict when exposed to bright light. It is a sign of neurosyphilis.

Alternative form of Robertian

plural of Robertine

Any member of the Frankish predecessor family of origin to the ruling houses of France.

plural of Robertian