Io

¹

[ ahy-oh, ee-oh ]

noun

1. Classical Mythology. a woman who, being loved by Zeus, was transformed into a white heifer and was, at the wish of Hera, first guarded by Argus and later pursued through the world by a gadfly until she reached Egypt, where she resumed her true shape: identified by the Egyptians with Isis.
2. Astronomy. a large volcanically active moon of the planet Jupiter.

Io

²

[ ahy-oh, ee-oh ]

noun

, plural I·os.

1. Io moth.

Io

³

Symbol, Chemistry.

1. ionium.

io

⁴

or 'i·o

[ ee-oh ]

noun

, plural i·os.

1. a small, solitary hawk, Buteo solitarius, having two plumage phases and breeding only on the Island of Hawaii, where it is a rare species and the only indigenous bird of prey: classified as near threatened.

Io.

⁵

abbreviation for

1. Iowa.

I/O

⁶

1. inboard-outboard.
2. Computers. input/output.

I.O.

⁷

or IO, i.o.

abbreviation for

1. indirect object.

Io

¹

/ ˈaɪəʊ /

noun

1. the innermost of the four Galilean satellites of Jupiter, displaying intense volcanic activity. Diameter: 3640 km; orbital radius: 422 000 km

Io

²

the chemical symbol for

1. ionium

Io

³

/ ˈaɪəʊ /

noun

1. Greek myth a maiden loved by Zeus and turned into a white heifer by either Zeus or Hera

I/O

⁴

abbreviation for

1. input/output

io

⁵

the internet domain name for

1. British Indian Ocean Territory

Io

/ ī′ō,ē′ō /

1. One of the four brightest satellites of Jupiter and the fifth in distance from the planet. It was first sighted by Galileo.
2. See Note at moon

Word History and Origins

Origin of Io¹

From Hawaiian ʿio

Example Sentences

The spacecraft produced the first high-resolution images of the four planets, the rings of Jupiter, Uranus and Neptune, lightning on Jupiter and lava lakes that revealed active volcanoes on Jupiter’s moon Io.

From New York Times

New images of Jupiter's volcano-studded moon Io, taken by the Large Binocular Telescope on Mount Graham in Arizona, offer the highest resolution of Io ever achieved with an Earth-based instrument.

From Science Daily

But although the planet is known to be smothered in volcanoes, an opaque atmosphere has prevented anyone from seeing an eruption the way spacecraft have spotted them on Io, the hypervolcanic moon of Jupiter.

From New York Times

Critics in the West have praised the film “Io Capitano” — nominated for the 2024 Academy Award for best international feature film — noting its visceral yet tender look at migration to Europe from Africa.

From New York Times

The properties of TOI-6713.01 are perhaps most similar to those of the Jovian moon Io, where scientists recently discovered a lava lake as smooth as glass.

From Salon