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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)

rhinitis
nounC1
/raɪˈnaɪ.tɪs/Inflammation of the mucous membrane inside the nose.
rhino
nounB1
/ˈraɪ.nəʊ/An informal, short term for a rhinoceros, a large, herbivorous mammal known for its thick skin and one or two horns on its snout.
rhinoceros
nounLow
/raɪˈnɒsərəs/A large, heavy, thick-skinned mammal with one or two horns on its nose, native to Africa and Asia.
rhinoceros beetle
nounLow frequency
/ˌrʌɪnɒs(ə)rəs ˈbiːt(ə)l/A very large, heavy-bodied beetle of the subfamily Dynastinae, characterized by a prominent horn on the head of the male, resembling a rhinoceros horn.
rhinoceros bird
nounVery Low
/raɪˈnɒs.ər.əs ˌbɜːd/A bird (specifically the red-billed oxpecker) that eats ticks, flies, and other parasites found on large mammals, especially rhinoceroses and other African ungulates.
rhinology
nounC2
/raɪˈnɒlədʒi/The branch of medicine that deals with the nose and its diseases.
rhinopharyngitis
nounVery Low
/ˌraɪ.nəʊ.ˌfær.ɪnˈdʒaɪ.tɪs/Inflammation of the mucous membrane of the nose and the pharynx.
rhinoplasty
nounC1
/ˈrʌɪnə(ʊ)plasti/A surgical operation to reshape the nose.
rhinorrhea
nounVery Low Frequency
/ˌraɪnəˈriːə/The excessive discharge of thin, watery mucus from the nose; a runny nose.
rhinoscopy
nounVery Low Frequency / Technical
/rʌɪˈnɒskəpi/The visual examination of the interior of the nose using an instrument (a rhinoscope).
rhinosporidium
nounVery Low (Technical/Specialist)
/ˌraɪnəʊspəˈrɪdɪəm/A genus of parasitic microorganisms that causes rhinosporidiosis, a disease affecting mucous membranes, primarily of the nose and eyes.
rhinovirus
nounC2
/ˈrʌɪnəʊˌvaɪrəs/A type of virus that is a common cause of the common cold.
rhizobium
nounLow
/raɪˈzəʊbiəm/A genus of bacteria that forms symbiotic nitrogen-fixing nodules on the roots of leguminous plants.
rhizocephalan
adjectivenounExtremely low (C2+ / specialist)
/ˌraɪzəʊˈsɛfələn/A highly specialized, parasitic barnacle that infests crabs and other crustaceans.
rhizoctonia
nounLow
/ˌraɪzɒkˈtəʊnɪə/A genus of imperfect fungi that are typically soil-borne pathogens, causing root rot, damping-off, and other diseases in many plants.
rhizoid
adjectivenounC2
/ˈraɪ.zɔɪd/A root-like structure that attaches a non-vascular plant (like a moss, liverwort, or alga) to its substrate, absorbing water and nutrients but not organized into true root tissues.
rhizome
nounC2 (Very low frequency)
/ˈraɪzəʊm/A horizontal underground stem of a plant, sending out roots and shoots from its nodes.
rhizomorph
nounC2
/ˈraɪzəʊmɔːf/A root-like structure formed by certain fungi.
rhizopod
adjectivenounC2
/ˈraɪzə(ʊ)pɒd/A type of single-celled organism, specifically a protozoan, that moves and feeds using temporary projections called pseudopodia.
rhizopus
nounLow
/ˈrʌɪzə(ʊ)pəs/A genus of common saprophytic fungi, typically forming a cottony white growth, often found on decaying organic matter like bread and fruit.

Showing 3521–3540 of 5802 words.