radius

Other forms of radius

plural

radii

Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.

Questions about radius

What does radius mean?

radius means "the length of a line segment between the center and circumference of a circle or sphere". That is the primary sense; the word has 5 in total, listed in full on this page.

How many syllables are in radius?

radius has 3 syllables: ra-di-us. The stress falls on "ra". In IPA it is /ˈɹeɪdiəs/.

What is another word for radius?

Close synonyms include r, spoke, wheel spoke. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is radius a common word?

radius is banded "Familiar" — widely understood, used when the subject calls for it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.