Silent <p>: At the head of words from Greek like pneumonia, pneumatic, psalm, pseudo-, psilocybin, pterodactyl, ptisan, ptomaine, ptyxis, and at the head of the Gaelic ptarmigan. Also at the end of receipt and its inflected forms. For more on silent <p> see the earlier question “Give me some examples of silent p at the end of words such as receipt.”
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