io

plural ios

1. A type of moth, the io moth.

   These lines appear to serve as roadways or guides to any stragglers that may have hung back for some reason known only to an io.

   1936, Paul Griswold Howes, Hand book for the curious

1. rareAn exclamation of joy or triumph.

   Do as thou wilt, as a great god can, O Pan! Io Pan! Io Pan! Io Pan Pan! I am awake In the grip of the snake.

   1913, Crowley, Aleister, “Hymn To Pan”, in Book 4, University of California Libraries, Magick in Theory and Practice

plural IOs

1. abbreviationcountableinitialismuncountablebusinessInitialism of input and output.
2. abbreviationcountableinitialismuncountablegrammarInitialism of indirect object.
3. abbreviationcountableinitialismuncountableInitialism of intelligence officer.
4. abbreviationcountableinitialismuncountableInitialism of incident officer.
5. SingaporeabbreviationcountableinitialismuncountablegovernmentInitialism of investigation officer.
6. abbreviationcountableinitialismuncountableinternational lawInitialism of international organization.

1. abbreviationemergency medicineAbbreviation of intraosseous.

1. Greekhuman sciencesThe daughter of Inachus river god, and a lover of Zeus, turned by the latter into a heifer.
2. astronomyA moon of Jupiter, known for its volcanic activity, peppered with about 400 active volcanoes.

   Another whisper, sir, near Io. We have probes en route.

   2004 November 9, Bungie, Halo 2, spoken by Cortana (Jen Taylor), Microsoft Game Studios, Xbox, level/area: Cairo Station

   1 more example

   A mottled blanket of debris from many active volcanoes gives Io the youngest surface in the solar system.

   1990 August, Bradford A. Smith, “Voyage of the Century”, in National Geographic, volume 178, number 2, page 50

3. astronomy85 Io, a main belt asteroid; the asteroid shares its name with the Jovian moon