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English Words Starting With R

5,802 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

respiratory syncytial virus
nounC2
/ˈrɛsp(ə)rət(ə)ri sɪnˈsɪʃəl ˈvaɪrəs/A common virus that causes infections of the lungs and respiratory tract, particularly in young children and older adults.
respiratory system
nounC1
/ˈrɛsp(ə)rət(ə)ri ˈsɪstəm/The organs and tissues involved in breathing, including the lungs, airways, and muscles.
respire
verbverb-intransitiveverb-transitiveLow
/rɪˈspaɪə(r)/to breathe
respirometer
nounC1
/ˌrɛspɪˈrɒmɪtə/An instrument for measuring the rate and character of respiration, especially oxygen consumption or carbon dioxide production.
respirometry
nounLow frequency (technical term)
/ˌrespɪˈrɒmɪtri/The measurement of respiration.
respite
nounverbverb-transitiveC1
/ˈrɛspaɪt/A short period of rest or relief from something difficult or unpleasant.
respite care
nounLow to Medium
/ˈrɛspaɪt ˌkɛə/Temporary professional care for a dependent person, allowing the regular caregiver a break.
resplendence
nounC2
/rɪˈsplen.dəns/Brilliant, splendid, or dazzling brightness and beauty, often to an impressive degree.
respond
nounverbverb-intransitive+1High frequency, common in B2-C1 levels and professional contexts.
/rɪˈspɒnd/To say or do something as a reaction to something that has been said or done.
respondence
nounVery Low
/rɪˈspɒndəns/The action or fact of responding or replying; correspondence.
respondent
adjectivenounB2
/rɪˈspɒn.dənt/A person who replies to something, especially one supplying information for a survey or questionnaire, or the defending party in a legal case.
respondent conditioning
nounLow
/rɪˈspɒndənt kənˈdɪʃənɪŋ/A learning process in which a previously neutral stimulus becomes associated with an unconditioned stimulus that naturally elicits a reflexive response, eventually causing the neutral stimulus to elicit a similar response.
responder
nounC1
/rɪˈspɒndə/A person or thing that answers or replies to something, often in a formal, emergency, or reactionary context.
responsa
nounVery low (C2)
/rɪˈspɒnsə/Written replies or decisions by rabbinic scholars on questions of Jewish law.
response
nounC1 (High Frequency)
/rɪˈspɒns/A verbal or written answer to a question or statement.
response time
nounB2
/rɪˈspɒns ˌtaɪm/The time taken for a system or person to react to a stimulus or request.
response variable
nounC2
/rɪˈspɒns ˌveə.ri.ə.bəl/In statistics and research methodology, a response variable is the primary outcome or result measured in an experiment or study; it's the variable whose values are expected to change as a result of manipulations to one or more explanatory (independent) variables.
responser
nounLow
/rɪˈspɒnsə/One who responds.
responsibilities
nounHigh
/rɪˌspɒnsəˈbɪlətiːz/Duties, tasks, or obligations that one is required to undertake, often arising from a specific role, job, or moral position.
responsibility
nounHigh frequency (C1-Band)
/rɪˌspɒnsəˈbɪləti/The state or fact of having a duty to deal with something or having control over someone; the state of being accountable or to blame for something.

Showing 2941–2960 of 5802 words.