Source : Webster's Revised Unabridged Dictionary (1913)

Gentoo \Gen*too"\ (j[e^]n*t[=oo]"), n.; pl. {Gentoos}
   (-t[=oo]z").
   A penguin ({Pygosceles t[ae]niata}). [Falkland Is.]

Gentoo \Gen*too"\, n.; pl. {Gentoos}. [Pg. gentio gentile,
   heathen. See {Gentile}.]
   A native of Hindostan; a Hindoo. [Archaic]