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  2. Derecho - Wikipedia

    en.wikipedia.org/wiki/Derecho

    A shelf cloud along the leading edge of a derecho in Minnesota Damage caused by a derecho in Barga, Italy. A derecho (/ ˈ d ɛ r ə tʃ oʊ /, from Spanish: derecho [deˈɾetʃo], 'straight') [1] is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale ...

  3. COVID-19 testing - Wikipedia

    en.wikipedia.org/wiki/COVID-19_testing

    In a diagnostic test, sensitivity is a measure of how well a test can identify true positives and specificity is a measure of how well a test can identify true negatives. For all testing, both diagnostic and screening, there is usually a trade-off between sensitivity and specificity, such that higher sensitivities will mean lower specificities ...

  4. Adjective - Wikipedia

    en.wikipedia.org/wiki/Adjective

    An adjective (abbreviated adj.) is a word that describes or defines a noun or noun phrase.Its semantic role is to change information given by the noun. Traditionally, adjectives are considered one of the main parts of speech of the English language, although historically they were classed together with nouns. [1]