the word swelling originates from the old english verb swellan, meaning to grow or become inflated, which itself has germanic roots. the addition of the noun-forming suffix -ing, from old english -ung, transforms the action into a concrete result or state. thus, the literal combination of "to grow" and "the act/result of" logically yields the modern meaning of an enlarged, often abnormal, bodily condition. this straightforward morphological process from a germanic verb to a noun describing a physical symptom has remained consistent for centuries.

Structure: swell (to grow larger) + ing (noun suffix) swell (from old english swellan, meaning to grow or bulge, a verb root). ing (from old english -ung, a suffix forming nouns from verbs, indicating an action or its result).