'accurately-guided' is a modern English compound formed from the adverb 'accurately' (itself from 'accurate' + the adverbial suffix '-ly') and the past participle 'guided' (from 'guide'). 'accurate' ultimately traces to Latin 'accuratus' (from 'ad-' + 'cura'), where 'ad-' meant 'to/toward' and 'cura' meant 'care'. 'guide' comes via Old French 'guider' (from a Germanic source, Proto-Germanic *witan- or related roots) meaning 'to show the way'.

'accurately-guided' developed from the phrase 'accurately guided' (two words) used in Modern English; 'accurate' entered English via Latin through Middle French and was used by the 17th century in senses of 'careful' or 'done with care', while 'guide' entered English from Old French 'guider' and earlier Germanic sources; the compound combination (adverb + past participle) is a straightforward modern formation used attributively (often hyphenated).

Initially the components conveyed 'made with care' ('accurate') and 'shown or led the way' ('guide'); together they originally implied 'led with care' and over time the compound has come to emphasize 'led with precision or correctness'—i.e., precise/accurate direction.