Because it is Ancient Greek and they did sound it. English has a lot of words originating from other languages with silent letters. Knight from knecht (German, servant), for instance.Pneum is a prefix used in reference to lungs. The initial p is usually not pronounced. Why is it there?
Pneuma meant wind, breath, or "air in motion", if memory serves (from lessons, not 'cos I was there! ). It also came to mean "breath of life", or soul, that sort of thing.I think pneuma = breath.
pulmonaryPneum is a prefix used in reference to lungs. The initial p is usually not pronounced. Why is it there?
Not relevant. Pulmonary is from Latin pulmo, pulmonis = lung, itself possibly derived from Greek pleumon, apparently.pulmonary
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https://www.merriam-webster.com/dictionary/pulmonary
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pulmonary
adjective
pul·mo·nary | \ ˈpu̇l-mə-ˌner-ē , ˈpəl-
Definition of pulmonary
1a : of, relating to, affecting, or occurring in the lungs pulmonary tissue pulmonary edema
b : carried on by the lungs pulmonary respiration
2 : pulmonate
3 : occurring in the pulmonary artery a pulmonary embolism
Not relevant. Pulmonary is from Latin pulmo, pulmonis = lung, itself possibly derived from Greek pleumon, apparently.
OK, the explanation seems valid.The prefix is technically pneumo- rather than just pneum.
As to reason why it's a silent "p", I believe it's 'cos we took the words and spelling from the ancient Greek, where the p wasn't silent. But to fit the existing "rules" in English (we had no rules for the pronunciation of words beginning in pt- or pn- as we didn't otherwise have such words) we kept the spelling but simply dropped pronunciation of the "p". Same with pterodactyl and other such words from Greek. Thus it subsequently became the rule.
There is at least one curiosity, though, in the word ptarmigan (species of bird). It's from the Scottish/Gaelic tarmachan but along the lines it was assumed to have come from a Greek word, so the silent-P was actually introduced! Yeah, we English are weird! Whether tarmachan was a Gaelic spelling of a previous Greek word, I don't know.