This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A male voice in an upper register beyond its normal range.

n. One who sings or talks in this register.

n. The "false" (singing) voice in any human, usually airy and lacking a purity of vowels; created by utilizing the next highest vocal folds above those used for speech and normal range singing. It is commonly confused with the Head Voice register.

n. A false or artificial voice; that voice in a man which lies above his natural voice; the male counter tenor or alto voice. See Head voice, under voice.

n. The highest or smallest register or quality in both male and female voices: so called because in its untrained state it is more or less unnatural and forced, and because at best it is usually intractable.

Having the quality and compass of the falsetto.

Assumed; constrained; unnaturally high-pitched; false.

adj. artificially high; above the normal voice range

n. a male singing voice with artificially high tones in an upper register

"Not to mention the annoying vagrant played by John C. Reilly, who speaks in falsetto throughout the film."

high    high-pitched   

head tone    head register    head voice   

voice   

voice   

stretto   

ear-splitting    full-throated    raspy    soprano    throaty    eldritch    high-pitched    raucous    singsong    wheeze