SAMURAIS
Noun
samurais
plural of samurai
Usage notes
Although samurais is often used, samurai is considered the proper plural of samurai.
Source: Wiktionary
SAMURAI
Sa"mu*rai`, n. pl. & sing. [Jap.]
Definition: In the former feudal system of Japan, the class or a member of
the class, of military retainers of the daimios, constituting the
gentry or lesser nobility. They possessed power of life and death
over the commoners, and wore two swords as their distinguishing mark.
Their special rights and privileges were abolished with the fall of
feudalism in 1871.
Source: Webster’s Unabridged Dictionary 1913 Edition