rachi

Dutch: ruggengraat-
English: spinal

Comes from the Greek 'rhachis', meaning 'spine' or 'backbone'.

Example:
Dutch: rachianesthesie
English: rachianesthesia

pH

The 'H' stands for Hydrogen, there is no accepted explanation for the 'p'. It could stand for power (English), potential (English, German, French) potenz (German), puissance (French), pondus (Latin), potentia (Latin).

It is a measure for acidity.