| AERONAUTS | • aeronauts n. Plural of aeronaut. • aëronauts n. Plural of aëronaut. • AERONAUT n. a traveller through the air; a balloonist, a pilot. |
| AQUANAUTS | • aquanauts n. Plural of aquanaut. • AQUANAUT n. a skin-diver; someone who explores and/or lives in the sea at considerable depth. |
| ARGONAUTS | • argonauts n. Plural of argonaut. • ARGONAUT n. (Greek) a sort of cuttlefish, aka paper nautilus. |
| ASTRONAUT | • astronaut n. A member of the crew of a spaceship or other spacecraft that travels beyond Earth’s atmosphere, or someone… • astronaut n. (Hong Kong) A returnee who frequently flies back and forth between Hong Kong and their adopted home country. • ASTRONAUT n. a person engaged in space travel. |
| COSMONAUT | • cosmonaut n. An astronaut, especially a Russian or Soviet one. • COSMONAUT n. a Russian astronaut. |
| CYBERNAUT | • cybernaut n. A voyager in cyberspace; a user of the Internet or virtual reality. • CYBERNAUT n. a person using the Internet. |
| HYDRONAUT | • hydronaut n. An undersea explorer, such as a submariner. • HYDRONAUT n. a person trained to work in an underwater vessel. |
| LUNANAUTS | • lunanauts n. Plural of lunanaut. • LUNANAUT n. an astronaut who has travelled to the moon, also LUNARNAUT. |
| LUNARNAUT | • lunarnaut n. Someone who travels to the Moon. • LUNARNAUT n. one who travels to the moon, also LUNANAUT. |
| NAUTILOID | • nautiloid n. A mollusc resembling a nautilus; specifically, a cephalopod of the subclass Nautiloidea. • nautiloid adj. (Zoology) Resembling a nautilus; pertaining to the subclass Nautiloidea. • NAUTILOID n. a mollusc of the subclass Nautiloidea, to which the nautilus and several extinct species belong. |
| NONAUTHOR | • nonauthor n. One who is not an author. • NONAUTHOR n. one who is not an author. |
| OCEANAUTS | • oceanauts n. Plural of oceanaut. • OCEANAUT n. someone who lives for periods under the sea, to observe and explore. |
| TAIKONAUT | • taikonaut n. A person who travels in space for the Chinese space program; a Chinese astronaut. • TAIKONAUT n. a Chinese astronaut. |
| ZORBONAUT | • zorbonaut n. (Sports) One who zorbs. • ZORBONAUT n. one who engages in zorbing. |