English Words Starting With R

• raceabout

  nounVery Low
  /ˈreɪsəbaʊt/A small, fast sailing yacht designed for racing, typically from the early 20th century.
• racecar

  nounC2
  /ˈreɪsˌkɑː/A palindrome; a land vehicle, typically open-wheeled and single-seat, designed specifically for high-speed racing competitions.
• racecard

  nounC1
  /ˈreɪskɑːd/A printed or digital programme listing the details and runners for the races at a specific horse racing or greyhound racing meeting.
• racecourse

  nounC1
  /ˈreɪskɔːs/A prepared ground or track where horse races or greyhound races are held.
• racegoer

  nounC1
  /ˈreɪsˌɡəʊ.ə/A person who attends horse races, especially as a regular hobby.
• racehorse

  nounB1
  /ˈreɪs.hɔːs/a horse that is bred and trained for competitive horse racing.
• racemate

  nounLow
  /ˈreɪsɪmeɪt/A mixture containing equal amounts of two enantiomers of a chiral compound.
• raceme

  nounC2 - Very low frequency; highly specialised/technical.
  /rəˈsiːm/An unbranched, elongated inflorescence with flowers attached by short stalks (pedicels) at equal distances along a central stem.
• racemic acid

  nounVery Low
  /rəˈsiːmɪk ˈæsɪd/A specific form of tartaric acid that is optically inactive because it consists of equal amounts of left- and right-handed enantiomers.
• racemism

  nounC2
  /ˈræs.ɪ.mɪ.zəm/The state or property of being a racemate, i.e., consisting of a mixture of equal quantities of two enantiomers (mirror-image molecules) that are not superimposable.
• racemization

  nounVery Low
  /ˌreɪsɪmaɪˈzeɪʃən/The chemical process of converting an optically active compound (one that rotates plane-polarized light) into a racemic mixture (an equal mixture of both enantiomers, resulting in no net optical activity).
• racemize

  verbVery Low
  /ˈreɪsɪmʌɪz/(Chemistry) To convert an optically active compound (one that rotates polarized light) into a racemic mixture, where both mirror-image forms (enantiomers) are present in equal amounts, resulting in no net optical activity.
• racer

  nounB2
  /ˈreɪsə(r)/A person, vehicle, or animal that competes in races.
• racerunner

  nounLow
  /ˈreɪsˌrʌnə/A fast-running lizard of the genus Aspidoscelis, native to the Americas.
• races

  plural-nounC1
  /ˈreɪsɪz/A competition of speed between participants or vehicles, often for a prize or championship.
• racetrack

  nounB2
  /ˈreɪs.træk/A circular or oval course with a prepared surface for horse or car racing, consisting of a track and often surrounding facilities.
• racetracker

  nounC1
  /ˈreɪsˌtrækə(r)/A device or person that monitors and records information about a race, often providing real-time positions, statistics, or predictive data.
• raceway

  nounC1
  /ˈreɪs.weɪ/A channel or artificial conduit for carrying something (like water, cables, or wires).
• rachel

  nounLow (for common noun usage: Very Low). High frequency as a personal name.
  /ˈreɪtʃ(ə)l/A proper noun, primarily used as a female given name. Originates from the Hebrew "Rāḥēl" meaning "ewe."
• rachilla

  nounC2
  /rəˈkɪlə/The axis of a grass spikelet; a small rachis in a compound inflorescence, especially in grasses and sedges.

Showing 81–100 of 5802 words.