1. The figure 0, indicating the absence of magnitude, or nothing. 2. In thermometry, the point from which the figures on the scale start in one or the other direction; in the Celsius and Réaumur scales, z. indicates the freezing point for distilled water; in the Fahrenheit scale, it is 32° below the freezing point of water. [Sp. fr. Ar. sifr, cipher]
- absolute z. the lowest possible temperature, that at which the form of translational motion constituting heat is assumed no longer to exist, determined as −273.15°C or 0 kelvin.
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1) the arithmetical symbol 0 or 0 denoting the absence of all magnitude or quantity
2 a) the point of departure in reckoning specif the point from which the graduation of a scale (as of a thermometer) begins
b) the temperature represented by the zero mark on a thermometer
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ze·ro (zeґro) [Ital. “naughtâ€] 1. the absence of all quantity or magnitude; naught. 2. the point on a thermometer scale at which the graduation begins; the ice point on the Celsius and Rйaumur scales and 32° below the ice point on the Fahrenheit.Medical dictionary. 2011.