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English Words Starting With S

15,552 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)

serodiagnosis
nounC2+
/ˌsɪərəʊˌdaɪəɡˈnəʊsɪs/A method of diagnosing a disease by detecting specific antibodies or antigens in a patient's blood serum.
serology
nounC1
/sɪˈrɒlədʒi/The scientific study of blood serum and other bodily fluids, especially in relation to the detection of antibodies and antigens for disease diagnosis.
serophobia
nounLow
/ˌsɪərə(ʊ)ˈfəʊbɪə/Irrational fear, hatred of, or prejudice against people who are HIV-positive or associated with HIV/AIDS.
seroreaction
nounVery Low
/ˌsɪərəʊrɪˈækʃ(ə)n/The detectable immune response in the blood serum, typically measured by the presence of specific antibodies following infection, vaccination, or exposure to an antigen.
serosa
nounC2/Technical/Low
/sɪˈrəʊsə/A thin membrane lining the internal body cavities and covering the surfaces of many internal organs.
serositis
nounVery Rare (Specialist)
/ˌsɪərə(ʊ)ˈsʌɪtɪs/Inflammation of a serous membrane, a thin lining that surrounds certain body cavities and organs, secreting a watery fluid.
serotherapy
nounVery low
/ˌsɪərəʊˈθɛrəpi/The treatment of disease by the injection of blood serum containing specific antibodies.
serotine
adjectivenounRare
/ˈsɛr.ə.taɪn/Occurring or developing late, especially in biological contexts such as botany or zoology.
serotonin
nounMedium
/ˌsɛrəˈtəʊnɪn/A chemical substance produced in the brain and other parts of the body that functions as a neurotransmitter, carrying signals between nerve cells, and is often associated with feelings of well-being and happiness.
serotype
nounverb-transitiveLow (C2)
/ˈsɪərə(ʊ)tʌɪp/A distinct variation within a species of microorganism (especially bacteria or virus) classified based on the antigens on its surface that trigger an immune response.
serous fluid
nounC2
/ˈsɪərəs ˈfluːɪd/A pale, watery, protein-rich bodily fluid that lubricates surfaces and fills cavities, distinct from blood, mucus, or pus.
serous membrane
nounLow
/ˌsɪərəs ˈmɛm.breɪn/A thin, double-layered membrane lining closed body cavities and covering their internal organs; it secretes a watery lubricating fluid called serous fluid.
serov
nounC2 (Very Low Frequency/Proper Noun)
/ˈsɛərɒf/ or /ˈsɛərɒv/A proper noun, primarily a transliterated Russian surname or the name of a historical figure, most notably the Soviet police and state security official Ivan Serov.
serow
nounLow (technical/zoological term)
/ˈsɛrəʊ/A goat-like antelope of mountainous regions in Asia.
seroxat
nounLow
/sɪˈrɒksæt/A brand name for paroxetine, a selective serotonin reuptake inhibitor (SSRI) used as an antidepressant.
serp
nounVery Low / Archaic / Niche
/sɜːp/A poetic or literary word for 'snake' or 'serpent', often used to evoke a more archaic or mythological tone.
serpens
nounVery Low
/ˈsɜː.pənz/A serpent, snake.
serpent
nounLow
/ˈsɜːpənt/A large snake, especially one seen as dangerous or symbolic.
serpent bearer
nounLow
/ˌsɜː.pənt ˈbeə.rər/A direct English translation of the name for the constellation Ophiuchus; a person who carries or holds a snake.
serpent star
nounLow
/ˌsɜː.pənt ˈstɑː/A marine invertebrate animal of the class Ophiuroidea, related to starfish, having a central disc and long, slender, flexible arms.

Showing 4121–4140 of 15552 words.