Does anyone have information about the etymology of this word common to all Romance languages (except Romanian?), e.g. fr. tirer, sp. tirar, it. tirare etc. The etymonline entry declares 'origin unknown' and suggest a connection with martyr. I remember reading from a spanish etymology book an interesting explanation that it descends from roman military jargon from times of campaigning against the Parthians (famous for their archery) and hence an ultimate iranian source but I haven't been able to find verification for this elsewhere.