radius etymology

Etymology:

• Late Latin: radius
• Classical Latin: radius, "ray, spoke of a wheel"
• Proto-Indo-European: *h₂reh₂ds-os, "spoke"

Meaning and Origin:

"Radius" originally meant "spoke of a wheel" in Latin. It derived from the Proto-Indo-European root *h₂reh₂ds-os, which means "spoke" or "rod." The root also gave rise to words in other languages, such as:

• Sanskrit: aratni, "spoke"
• Greek: arathis, "spoke"
• Old English: raed, "spoke, bar"
• German: Rad, "wheel"

Over time, the meaning of "radius" expanded to include other meanings related to its shape:

• Astronomy: The distance from the center of a circle or sphere to its edge, especially the distance from the center of the Earth to the equator.
• Anatomy: The long, slender bone in the forearm that runs from the elbow to the thumb.
• Geometry: A line segment that connects the center of a circle or sphere to a point on its edge.
• Mathematics: The number that divides the circumference of a circle by its diameter, approximately 3.14159.

radius relate terms

• radial

  Etymology The word radial is derived from the Latin word radius which means ray or

• radius

  Etymology Late Latin radius Classical Latin radius ray spoke of a wheel Proto Ind

• radian

  Etymology The word radian is derived from the Latin word radius meaning ray or sp

• radius

  Etymology Late Latin radius Classical Latin radius ray spoke of a wheel Proto Ind

• radiation

  Etymology Latin radiare to radiate emit rays Indo European h₁reh₁ to shine

• spoke

  Etymology The word spoke comes from the Old English word spaca which means spoke o

• verge

  Etymology The word verge has several etymologies Latin virga a rod twig vir

• compass

  Etymology Old French compas Latin compassus stride Vulgar Latin compassare to

• rapt

  Etymology The word rapt comes from the Latin word rapere meaning to seize or to c

• part

  Part Etymology Middle English in the sense portion portion of a whole from Old

• trap

  Etymology The word trap has origins in several languages Old English træppe Midd

• ignore

  Noun cat dog tree car book Verb run jump walk talk eat Adjective big small red

• region

  Etymology The word region derives from the Latin word regiō meaning district ter