The word 'whirling' is built upon the verb 'whirl', which entered Middle English from Old Norse hvirfla, meaning "to turn about". This Norse term is related to the Old English hweorfan, meaning "to turn, go about", both tracing back to the Proto-Germanic root hwerb-, "to turn". The suffix '-ing' is a productive Germanic element used to create present participles and verbal nouns. Thus, the literal construction "turning-rapidly" perfectly captures the modern sense of a rapid, spinning motion, connecting the ancient concept of circular movement directly to its contemporary descriptive use.

Structure: whirl (to turn rapidly) + ing (adjective/gerund suffix) - whirl: From Middle English whirlen, of Scandinavian origin; related to Old Norse hvirfla "to go around". Its functional role is the core verb root meaning to spin or turn. - ing: A suffix from Old English -ende (present participle) and -ung (verbal noun). Its functional role is to form the present participle (adjective) or gerund (noun) from the verb.