Etiology as the origins study in linguistics is meant here to find the origin for the European words for the Egyptian pyramids.
It seems there is no acceptable answer to this question, leaving a lot of room for imagination. If the pyramids were pharaoh tombs, would that not be the origin for the Greek word? The Ancient Egyptian (AE) word for a pyramid transliterates to MR. I agree with I.E.S. Edwards, quoted later by Mark Lehner quoted again himself in the book Land of Osiris, that the Ancient Egyptians did not name it a pharaoh tomb but “place of ascension” which Edwards gives as an etymology for MR. He had doubts whether this was correct. I think pyramid as “pharaoh tomb” is not found in AE writings as that would mean the AE would acknowledge that the pharaoh was dead; something culturally inconceivable, because he was believed to ascend to heaven and live (see Pyramid texts). But foreigners considered the pharaoh human and his burial site was thus not called a ‘place of ascension’ by foreigners, but a ‘pharaoh grave’ (Modern Hebrew: pr3h mt) or ‘pharaoh tomb’ (AE pr maHat or maHat pr). So what is the etiology of the word ‘pyramid’?