Life and health

Cypripedium acaule

Cypripedium acaule, pink lady's slipper or moccasin flower, is a North American orchid with two basal leaves and a pink pouch-like lip, blooming April to July on acidic soils from bogs to pine forests; IUCN Least Concern.

Cypripedium calceolus

Cypripedium calceolus, the lady's slipper orchid, is a Eurasian woodland orchid with maroon twisted petals and a yellow slipper lip; nectarless and deceptive, Least Concern globally but threatened across much of Europe.

Cypripedium reginae

Cypripedium reginae, or showy lady's slipper, is a terrestrial orchid native to central and eastern North America. It is known for its white sepals and pink, pouch-shaped lip.

Cyprofuram

Cyprofuram (SN 78314, Chinese 酯菌胺) is an obsolete systemic anilide (phenylamide) fungicide, CAS 69581-33-5, formerly used on vines and potatoes against Oomycetes; it inhibits zoospore release and nucleic acid synthesis and is not EU-approved.

Cyproheptadine

Cyproheptadine (Periactin, glutodine), a first-generation H1-antihistamine approved 1961, also blocks 5-HT2A and muscarinic receptors; used for allergy, appetite stimulation, serotonin syndrome, and pediatric cyclic vomiting.

Cyproterone acetate

Cyproterone acetate, sold under trade names including Androcur, is a synthetic steroidal antiandrogen and progestogen used for androgen-dependent conditions such as hirsutism, acne, and prostate cancer, with a known meningioma risk at higher doses.

Cyprus cat

Cyprus cat, also called Cypriot, Saint Helen, or Saint Nicholas cat, a landrace domestic cat from Cyprus linked to a 9,500-year-old Neolithic burial; medium-large, athletic, independent, not formally recognized as a pedigree breed.

Cyril Chantler

Sir Cyril Chantler, born 1939, is a British pediatric nephrologist who led Guy's and Great Ormond Street hospitals, chaired UCL Partners, and reviewed tobacco packaging.

Oct 10, 2026

Cyril Clarke

Sir Cyril Astley Clarke (1907–2000) was a British physician and lepidopterist whose Liverpool team showed that anti-D given to mothers after delivery prevents rhesus disease of the newborn.

Cyril Herry

Cyril Herry (born 1973) is a French neurophysiologist, Directeur de recherche at Inserm in Bordeaux, known for Nature papers showing how prefrontal and amygdala circuits switch fear on and off.

Cyril Norman Hugh Long

Cyril Norman Hugh Long (1901–1970) was an English-born American endocrinologist who held two Sterling Professorships at Yale, isolated pituitary hormones including ACTH, and studied the endocrine control of diabetes.

Cyril Wecht

Cyril H. Wecht (1931–2024), American forensic pathologist, attorney, and Allegheny County coroner 1970–1980 and 1996–2006; leading critic of the Warren Commission's single-bullet theory and commentator on JFK, Elvis Presley, and JonBenét Ramsey deaths.

Cyril Zipfel

Cyril Zipfel is a plant scientist who studies how plants detect and ward off bacterial and fungal pathogens, known for identifying the Arabidopsis immune receptor EFR in 2006.

Cyrilla

Cyrilla (titi) is a genus of ten accepted shrub and tree species in Cyrillaceae, Ericales, native from the southeastern U.S. to tropical America; the widespread swamp titi, Cyrilla racemiflora, forms wetland thickets, resprouts after fire, and yields valued honey.

Cyromazine

Cyromazine is an insect growth regulator, a triazine derivative insecticide that disrupts moulting and pupation, used against leafminers, livestock flies, and blowfly strike on sheep.

Cyrtaucheniidae

Cyrtaucheniidae, a mygalomorph trapdoor spider family (Simon, 1889) with type genus Cyrtauchenius; long treated as polyphyletic, relimited by Opatova et al. 2020 and Montes de Oca et al. 2022; now 6 genera, 109 species.

Cyrtobagous salviniae

Cyrtobagous salviniae, the salvinia weevil, is a 2–3.5 mm Brazilian weevil used worldwide since 1980 as the principal biological control agent against invasive Salvinia molesta and Salvinia minima aquatic weeds.

Cyrtodactylus

Cyrtodactylus (bent-toed geckos), genus Cyrtodactylus Gray, 1827 of Gekkonidae: 400+ species from South Asia to Melanesia, originated circum-Himalayan after the K/Pg boundary, diversified west to east, includes many karst specialists and cryptic species.

Cyrtomium falcatum

Cyrtomium falcatum (オニヤブソテツ), Japanese holly fern or Japanese netvein hollyfern, is an East Asian evergreen Dryopteridaceae fern with glossy falcate pinnae; it occurs as diploid sexual, triploid apogamous (n=123, 32 spores), and tetraploid sexual cytotypes and has escaped cultivation in North America and Europe.

Cyrtospirifer

Cyrtospirifer (type species Spirifer verneuili) is an extinct Devonian spiriferid brachiopod genus, family Cyrtospiriferidae, ranging from middle Givetian to lower Famennian and used as an Upper Devonian index fossil.

Sep 20, 2026

Cyrus Chothia

Cyrus Chothia, also known as C. H. Chothia, was a British bioinformatician at the MRC Laboratory of Molecular Biology who created the SCOP protein structure classification.

Cyrus Levinthal

Cyrus Levinthal (1922–1990) was an American molecular biologist and geneticist who worked on phage genetics, the genetic code, and protein folding, and is best known for the Levinthal paradox.

Cyrus R. Safinya

Cyrus R. Safinya is an American biophysicist and Distinguished Professor of Materials at UC Santa Barbara, known for work on cationic liposome–DNA complexes for gene delivery.

Cyrus S. Poonawalla

Cyrus S. Poonawalla, Indian billionaire founder-chairman of Serum Institute of India (founded Pune, 1966), the world's largest vaccine maker by doses; Padma Bhushan 2022, Oxford honorary DSc 2019.

Cyst

Cyst: a closed tissue sac filled with fluid, pus, air, or keratin, forming in skin, ovaries, breasts, kidneys, and other organs; true cysts have epithelial linings, unlike pseudocysts, and most are benign.

Oct 20, 2026

Cyst in the anterior chamber of the eye

Cyst in the anterior chamber of the eye (ICD-11 9A82), usually an iris cyst; primary pigment epithelial cysts are typically stationary, while secondary implantation cysts after trauma or surgery enlarge and cause glaucoma, requiring aspiration, laser, or excision.

Cyst of pancreas

Cyst of pancreas (pancreatic cyst): a fluid-filled lesion in the pancreas, found in 2–20% of CT/MRI scans. Types range from benign pseudocysts and serous cystadenomas to mucinous IPMNs and MCNs with malignant potential; managed by MRI surveillance or surgery.