the word 'stiletto' entered english in the early 17th century directly from italian, where 'stiletto' is a diminutive of 'stilo', meaning 'dagger'. the italian 'stilo' itself derives from the latin 'stilus', which referred to a pointed instrument for writing, engraving, or stabbing, highlighting its fundamental meaning of a sharp point. the modern english meanings retain this core idea of a sharp, slender object, applying it first to a slender dagger and later, metaphorically, to the thin, high heel of a shoe which resembles the weapon's shape.

Structure: stilet (dagger) + o (noun suffix) stilet (from italian 'stiletto', a diminutive of 'stilo' meaning 'dagger' or 'pointed instrument', from latin 'stilus' meaning 'pointed instrument, stake, stylus'); o (a common italian noun ending, often used to form masculine nouns).