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tlhIngan Hol pronoun, commonly translated as "she/he" (or "her/him"), though in some cases it might also be translated as "it". This singular third-person pronoun is neutral with regard to gender, but is only used of beings capable of using language to communicate. (tlhIngan Holreference: The Klingon Dictionary)
Klingon word for acne. When the Ba'ku's planet's "fountain of youth" qualities resulted in Worf developing a large gorch, Jean-Luc Picard thought it was the result of a fight. Data corrected him, explaining the gorch, to which Picard added, "It's hardly noticeable." William Riker's own response to the gorch: "You Klingons never do anything small, do you?" (TNGmovie: Insurrection)
Klingonaase word that some might translate as "ugly", but more accurately means "unattractive for mating". It is considered an insult, but only between members of the same species. (FASAmodule: The Klingons)