Pudrir and Foul

The Spanish pudrir, “to rot,” has a surprising connection to the English, foul, a word meaning the same but sadly very underused these days — although still when quoting Macbeth: fair is foul and foul is fair!

Both come from the same Indo-European root *pu, meaning, “to rot.” 

But the English one sounds so different because, in the Germanic branch of Indo-European, the p- sound turned into the f- sound. But now in the Latin branch.

Thus the initial f+vowel of foul maps to the initial f+vowel of pudrir.

From the same root are more fun words including defile, putrid, and pus. What wonderful imagery!

Padre and Father

Father is one of the most basic words in every language and a traceable pattern throughout the Indo-European languages.

The original PIE sound “p-” changed in all the Germanic languages to “f-”. This is referred to as “Grimm’s Law”, from the fairy-tale fabulist who first noted this pattern.

In the Latin languages such as Spanish, the original “p-” sound was preserved. Thus, the Spanish padre’s p‑d-r root maps to the English father’s f‑th‑r root.

Pegar and Pituitary and Fat

The Spanish pegar (“to paste”) comes from the Latin pix, meaning “tar.” That makes sense: “paste” looks like just a more diluated “tar.”

But pix itself comes from the Proto-Indo-European root pei(e), which meant, fat — think of animal fat, for example. It makes sense that this word evolved into a word meaning “tar”: that’s a bit what animal fat looks like.

From this same root pei(e), we get a few notable English words:

• Fat — Fat itself comes from this root! This is through the PIE p- sound transforming into the f- sound as it evolved into German and English. Think about father/padre, for example.
• Pituitary — The same root came back in, via an educated Latin, to mean, the pituitary gland. Why? Because the ancients believed that this slimy gland is what produced mucous/snot — the smile of the nose. A bit like tar, isn’t it? We can see the P- root preserved here, too.

Pluma and Fleece

Pluma, Spanish for “feather”, sounds nothing like the English feather.

But it is a cousin to the English fleece.

Both come from the same Indo-European root *pleus‑, which meant “feather” or to “pluck.”

But they sound so different! That is because the Indo-European p- sound stayed the same into Latin then Spanish, but changed into a f- in the Germanic branch (including English). 

Thus the p‑l of pluma maps to the f‑l of fleece.

Espuma and Foam

The Spanish for “foam”, espuma, comes from the Latin for the same: spuma. And this Latin comes from the Proto-Indo-European root *(s)poi-moi from which we also get the English… foam.

How so? Because the PIE root p- very consistently became an f- as it evolved into German then English, but this transformation never happened when it became Latin and then Spanish. Note words like foot/pie and father/padre.

Thus the f‑m of foam maps to the (s)-p‑m of espuma very clearly!