The word 'topically' originates from the Greek topos, meaning 'place' or 'commonplace'. In ancient rhetoric, this evolved to refer to a general subject or theme of argument, a 'topic'. The Latin suffix -alis was added to form the adjective 'topical', meaning 'pertaining to a topic or subject'. Finally, the Old English adverbial suffix -lice (modern -ly) was appended, creating 'topically', which describes an action done in relation to a specific subject or, in medical contexts, applied to a specific bodily 'place' or surface.

Structure: topic (subject) + al (adjective suffix) + ly (adverb suffix) - topic: From Latin topica, from Greek ta topika ('matters concerning commonplaces'), from topos ('place', 'commonplace'). - al: A suffix forming adjectives, from Latin -alis. - ly: A suffix forming adverbs from adjectives, from Old English -lice.