Проверочное слово к слову циклон

The headmistress announced that the break was at ten forty-five. And she told to come straight to the staff room. She said that she would wait there till I joined them. She promised to introduce me to those I hadn`t met on my first visit.  She asked if I liked the idea of having a cup of tea then.  She said that they needed rest after all. And she added if there was anything that puzzled me, she would be in her room. She said that I could depend on her. She offered that I just sent a message by one of the children.

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Это словарное слово,по крайней мере,оно не проверяется