We found 17 dictionaries that define the word arc second:

General (9 matching dictionaries)

1. arc second: Merriam-Webster
2. arc second: Oxford Learner's Dictionaries
3. arc second: Collins English Dictionary
4. arc second: Infoplease Dictionary
5. arc-second, arc second: Dictionary.com
6. Arc-second, Arc second: Wikipedia, the Free Encyclopedia
7. Arc second: TheFreeDictionary.com
8. arc second: Merriam-Webster
9. arc second: Wiktionary

Business (1 matching dictionary)

10. Arc second: Legal dictionary

Computing (1 matching dictionary)

11. Arc second: Encyclopedia

Medicine (1 matching dictionary)

12. Arc second: Medical dictionary

Miscellaneous (1 matching dictionary)

13. Arc second: Idioms

Science (3 matching dictionaries)

14. Arc Second: Eric Weisstein's World of Mathematics
15. Imagine the Universe! Dictionary (No longer online)
16. ARC SECOND: Zoom Astronomy Glossary

Tech (1 matching dictionary)

17. High-Energy Astrophysics (No longer online)

Definitions from Wiktionary (Arc second) ▸ noun:  Alternative form of arcsecond [A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree.] Similar: arcsecond, arcminute, nanosecond, arcsine, arciform, millisecond, microsecond, picosecond, seconds, arcsin, more... ▸ Words similar to arc second ▸ Usage examples for arc second ▸ Idioms related to arc second ▸ Wikipedia articles (New!) ▸ Words that often appear near arc second ▸ Rhymes of arc second ▸ Invented words related to arc second