The name of which form of transport is derived from Greek words meaning spiral and wing?
Helicopter rotor of rotary-wing aircraft (rotorcraft). The name is derived from the Greek words "helix", helik-, meaning spiral; and "pteron" meaning wing. The use of a rotor for vertical flight has existed since 400 BC in the form of the bamboo-copter, an ancient Chinese toy. The bamboo-copter is spun by rolling a stick attached to a rotor. The spinning creates lift, and the toy flies when released. The philosopher Ge Hong's book the "Baopuzi" (Master Who Embraces Simplicity), written around 317, describes the apocryphal use of a possible rotor in aircraft: "Some have made flying cars [feiche 飛車] with wood from the
Plural form of words ending in -us has a plural "priora", the "Lada Priora" having prior claim to that name—though the common plural is "Priuses". The Winklevoss twins are sometimes collectively referred to as "the Winklevi". Plural form of words ending in -us In English, the plural form of words ending in "-us", especially those derived from Latin, often replaces "-us" with "-i". There are many exceptions, some because the word does not derive from Latin, and others due to custom ("e.g.", "campus", plural "campuses"). Conversely, some non-Latin words ending in "-us" and Latin words that did not have their Latin plurals with "-i" form their English