apical annulus
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Schizaea — noun type genus of the Schizaeaceae cosmopolitan especially in tropics; small leptosporangiate ferns: curly grass fern • Syn: ↑genus Schizaea • Hypernyms: ↑fern genus • Member Holonyms: ↑Schizaeaceae, ↑family Schizaeaceae … Useful english dictionary
fern — fernless, adj. fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a… … Universalium
Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… … Universalium
ear, human — ▪ anatomy Introduction organ of hearing and equilibrium that detects and analyzes noises by transduction (or the conversion of sound waves into electrochemical impulses) and maintains the sense of balance (equilibrium). The human ear, like … Universalium
Glossary of plant morphology terms — Biologists that study plant morphology use a number of different terms to describe plant organs and parts that can be observed with the human eye using no more than a hand held magnifying lens. These terms are used to identify and classify plants … Wikipedia
Mitral regurgitation — See also: aortic insufficiency and tricuspid insufficiency Mitral regurgitation Classification and external resources Mitral regurgitation (schematic drawing) During systole, contraction of the left … Wikipedia
ring — 1. A circular band surrounding a wide central opening; a r. shaped or circular structure surrounding an opening or level area. SYN: anulus [TA]. 2. The closed ( i.e., endless) chain of atoms in a cyclic compound; commonly used for “cyclic” or… … Medical dictionary
Mitral valve — Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. (Mitral valve labeled at center right.) … Wikipedia
Arrhythmogenic right ventricular dysplasia — Classification and external resources Photomicrograph of an ARVC heart. ICD 10 I … Wikipedia
Mushroom — The mushroom Amanita muscaria, commonly known as fly agaric A mushroom is the fleshy, spore bearing fruiting body of a fungus, typically produced above ground on soil or on its food source. The standard for the name mushroom is the cultivated… … Wikipedia
