With this use of the word, philologically inexact, but historically quite defensible, may be compared the use of the word English, which is not exactly the language of the Angles, or of the word French, which is not exactly the language of the Franks.
Like the Arabic jar (which is philologically cognate to ger), the ger attached himself as a client to an individual or as a protected settler to the community.
It is no part of the word philologically.
Vinegar (or impure acetic acid), which is produced when wine is allowed to stand, was known to both the Greeks and Romans, who considered it to be typical of acid substances; this is philologically illustrated by the words OEbs, acidus, sour, and duos, acetus, vinegar.
Spener, he founded the Collegium Philobiblicum, at which a number of graduates were accustomed to meet for the systematic study of the Bible, philologically and practically.