'pistil-related' is formed from 'pistil' and 'related'. 'pistil' originates from Latin, specifically the word 'pistillum', where 'pistillum' meant 'pestle'. 'related' originates from Latin, ultimately from the past participle 'relatus' of 'referre'.

'pistil' changed from Latin 'pistillum' into Old French and Middle English forms 'pistil' and eventually became the modern English 'pistil'. 'related' developed from Latin 'relatus' through Old French 'relater' and Middle English 'relaten', becoming the modern adjective 'related'.

Initially, 'pistillum' meant 'pestle' (a tool), but over time it came to denote the pistil, the central female part of a flower. 'related' originally had senses tied to 'bringing back' or 'recounting' and later evolved to mean 'connected' or 'having a relationship to'.