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A 60th part of a minute of arc
Answer for the clue "A 60th part of a minute of arc ", 9 letters:
arcsecond
Word definitions for arcsecond in dictionaries
WordNet
Word definitions in WordNet
n. a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here" [syn: second ]
Wiktionary
Word definitions in Wiktionary
n. A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree.