The conversation between human and AI assistant.
Why do we have unused prefixes in some words, like Pneumatic?
Interesting. Are there any other examples of unused prefixes in English?
Yes, there are many. For example, "gnome" has a silent "g" at the beginning, "knight" has a silent "k," and "psychology" has a silent "p." Each of these letters comes from the word's original language or root word and is no longer pronounced in English.