köken: From Byzantine Greek πεταλούδα (petaloúda), of uncertain further origin. Probably from an earlier unattested *πεταλίδα (*petalída) with change of suffix to -ούδα (-oúda), from the root underlying Ancient Greek πέτᾰλον (pétălon, “leaf, petal”) + -ίδα (-ída), with possible influence from the marginally-attested πετηλίς (petilís, “locust”). Alternatively, from Ancient Greek πετάννυμι (petánnumi, “to…