| false-heart | Hollow or unsound at the core; treacherous; deceitful; perfidious. Source: Websters Dictionary (01 Mar 1998) |
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| false-hearted | Hollow or unsound at the core; treacherous; deceitful; perfidious. Source: Websters Dictionary (01 Mar 1998) |
| false-negative reaction | <statistics> An erroneous or mistakenly negative response. Negative test results in subjects who possess the attribute for which the test is conducted. The labeling of diseased persons as healthy when screening in the detection of disease. (05 Mar 2000) |
| false-positive reaction | <statistics> An erroneous or mistakenly positive response. Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (05 Mar 2000) |
| falsetto | <otolaryngology> A false or artificial voice; that voice in a man which lies above his natural voice; the male counter tenor or alto voice. Origin: It. Falsetto, dim. Fr. L. Falsus. See False. Source: Websters Dictionary (01 Mar 1998) |