Gadling is a word that is not commonly used in modern English, but has been seen in historical texts. Its spelling is somewhat unusual, as the sound "gad" is usually spelled with a double "d" as in "gadded". However, in this case, the spelling is consistent with the pronunciation, which is /ˈɡædlɪŋ/ (gad-ling). The "ing" ending indicates a present participle form, which could mean "one who is gadding about" or "one who engages in restless or foolish behavior."
The word "gadling" is derived from the Middle English term "gadelyng", which ultimately traces its roots back to Old Norse, an ancient North Germanic language. In Old Norse, the word "gadda" or "gaddr" meant a "spike" or "point", while "lingr" denoted a "person" or "follower". Combined, these words formed "gadlingr", referring to a "spike-wielder" or "warrior". Over time, the term evolved and its meaning shifted to simply mean a "companion" or "fellow" in Middle English. Today, "gadling" is archaic and rarely used.