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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)

rectory
nounC1
/ˈrekt(ə)ri/The house where a rector (a priest or minister in charge of a parish) lives.
rectrix
nounVery low (technical term)
/ˈrekt.rɪks/A main tail feather of a bird, specifically used for steering during flight.
rectum
nounLow
/ˈrɛktəm/The final section of the large intestine, ending at the anus.
rectus
nounLow frequency, primarily used in technical and medical contexts.
/ˈrɛktəs/A straight muscle in the human body, often part of compound anatomical terms.
recumbent
adjectivenounC1
/rɪˈkʌmbənt/Lying down; reclining; resting in a horizontal position.
recumbent bicycle
nounC1/C2 (Low-frequency, specialized vocabulary)
/rɪˈkʌmbənt ˈbaɪsɪkl/A bicycle designed to be ridden in a reclining position, with the rider's back supported and the pedals positioned in front rather than below.
recuperate
verbverb-intransitiveverb-transitiveC1
/rɪˈkuː.pər.eɪt/To recover from illness or exhaustion; to regain health or strength.
recuperation
nounC1
/rɪˌkjuːpəˈreɪʃ(ə)n/The process of recovering from illness, injury, or exhaustion.
recuperative furnace
nounLow
/rɪˈkjuːpərətɪv ˈfɜːnɪs/A type of industrial furnace that recovers waste heat from exhaust gases to preheat combustion air, thereby improving energy efficiency.
recuperator
nounLow (Technical)
/rɪˈkjuː.pə.reɪ.tə/A device for recovering waste heat from industrial processes, exhaust gases, or ventilation systems.
recur
verbverb-intransitiveB2
/rɪˈkɜː(r)/to happen or appear again or repeatedly, especially after a period of time.
recurrence
nounC1
/rɪˈkʌrəns/The act or fact of happening or appearing again, especially after a period of time.
recurrent fever
nounC1
/rɪˈkʌrənt ˈfiːvə/A fever that happens repeatedly, returning after periods of normal temperature.
recurring decimal
nounC1
/rɪˈkɜːrɪŋ ˈdɛsɪm(ə)l/A decimal number in which a digit or group of digits repeats infinitely.
recursion
nounC1-C2
/rɪˈkɜː.ʒən/The process of defining something in terms of itself, often in a way that involves repeated application of a rule or procedure.
recursion formula
nounLow
/rɪˈkɜː.ʒən ˈfɔː.mjʊ.lə/A rule that defines each term in a sequence based on the previous term(s).
recursive definition
nounC1/C2
/rɪˌkɜː.sɪv ˌdef.ɪˈnɪʃ.ən/A definition that defines a term using the term itself, relying on a base case to prevent infinite regression.
recursive function
nounC1
/rɪˈkɜːsɪv ˈfʌŋkʃən/A function in mathematics or computer science that calls itself during its execution to solve a problem by breaking it down into smaller, similar sub-problems.
recursive subroutine
nounC2
/rɪˈkɜːsɪv ˌsʌbruːˈtiːn/A subroutine (function or procedure) that calls itself directly or indirectly during its execution.
recurve
verbverb-ambitransitiveC1
/ˌriːˈkɜːv/To bend backwards or in a reverse curve.

Showing 1561–1580 of 5802 words.