Whooping cough is pertussis; one common brand of cough medicine is Robitussin.
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The root word for "antitussive" is "tussive," which comes from the Latin word "tussis" meaning cough. In this context, "anti-" is a prefix meaning against, so "antitussive" refers to something that works against coughing.
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According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 6 words with the pattern -U-SI-.
That is, six letter words with 2nd letter U and 4th letter S and
5th letter I. In alphabetical order, they are: