The Collaborative International Dictionary
Periscians
Periscians \Pe*ris"cians\, Periscii \Pe*ris"ci*i\, n. pl. [NL. See Periscian.] Those who live within a polar circle, whose shadows, during some summer days, will move entirely round, falling toward every point of the compass.
Wiktionary
periscians
n. (plural of periscian English)