All articles starting with D

Degenerative disc disease

Degenerative disc disease, also called discogenic disease or intervertebral disc degeneration, is painful breakdown of spinal discs; imaging degeneration is nearly universal with age, definitions vary, and treatment is mostly conservative.

Degenerative disease

A degenerative disease, also called a degenerative disorder, is one marked by progressive deterioration in how affected tissues or organs work; examples include osteoarthritis, osteoporosis, and Alzheimer disease.

Degenerative high myopia

Degenerative high myopia, also called pathologic myopia, is a form of myopia in which excessive elongation of the eyeball causes structural damage that can lead to vision loss.

Degenerative mitral valve prolapse

Degenerative mitral valve prolapse, also called Barlow disease or myxomatous MVP, is connective-tissue degeneration of the mitral valve causing leaflet displacement ≥2 mm above the annulus, mitral regurgitation, and in a subset arrhythmic risk.

Degenerin

Degenerin is a group of ion channel proteins of the ENaC/DEG family in the nematode C. elegans, named for mutations that cause sensory neurons to swell and die.

Deggingen

Deggingen, municipality in Landkreis Göppingen, Baden-Württemberg, in the upper Filstal. Merovingian settlement, Helfenstein and Wiesensteig rule, Württemberg from 1806; elephant arms, baroque Holy Cross church, Roman fortlet Schonterhöhe.

Deglet Nour

Deglet Nour (Deglet Noor), the 'queen of dates', is a semi-dry Algerian date palm cultivar from Tolga, dominant in Tunisia and Algeria, translucent, sweet, and one of the world's two most-traded dates.

Sep 19, 2026

Degna Djan

Degna Djan, also written Degna-Zan, is a legendary king of Aksum traditionally placed in the 9th or 10th century AD and known only from later traditions.

DeGolyer & MacNaughton

DeGolyer & MacNaughton is an independent petroleum consulting firm founded in Dallas, Texas, in 1936 by Everette Lee DeGolyer and Lewis MacNaughton to estimate oil and gas reserves.

Degradation of the extracellular matrix

Degradation of the extracellular matrix (ECM breakdown, Reactome R-HSA-1474228): enzymatic cleavage of collagens, elastin, fibronectin, laminins, and proteoglycans by MMPs, ADAMTS, and serine proteases, regulated by TIMPs and the cysteine-switch mechanism.

Sep 29, 2026

Degradation testing

Degradation testing is a reliability engineering method that measures how a product's performance deteriorates over time and predicts failure times, enabling reliability assessment for highly reliable products with few or no observed failures.

Sep 29, 2026

Degradome sequencing

Degradome sequencing, also known as PARE or GMUCT, is a high-throughput sequencing method that maps RNA decay fragments to identify microRNA-directed mRNA cleavage sites genome-wide, most informatively in plants.

Degrassi

Degrassi is a Canadian teen television franchise created by Linda Schuyler and Kit Hood, beginning with The Kids of Degrassi Street (CBC, 1979), continuing through Degrassi Junior High, Degrassi High, Degrassi: The Next Generation (2001-2015), and Netflix's Degrassi: Next Class, known for frank treatment of teen issues.

Degrassi High

Degrassi High, the third Degrassi series by Linda Schuyler and Kit Hood, aired on CBC 1989–1991 with 28 episodes, followed the Degrassi Junior High kids into high school, tackled abortion, AIDS, and suicide, and ended with the 1992 movie School's Out.

Degrassi Junior High

Degrassi Junior High (1987-1989), created by Kit Hood and Linda Schuyler, is a Canadian CBC/PBS teen drama spin-off of The Kids of Degrassi Street, continuing as Degrassi High and The Next Generation.

Degrassi: Next Class

Degrassi: Next Class (2016–2017) is the fifth Canadian teen drama in the Degrassi franchise, created by Linda Schuyler and Stephen Stohn, airing on Family Channel and Netflix in four 10-episode seasons with hashtag episode titles.

Degrassi: The Next Generation

Degrassi: The Next Generation (later Degrassi) is a Canadian teen drama created by Linda Schuyler and Yan Moore, airing on CTV, MuchMusic, and The N/TeenNick from 2001 to 2015 across 14 seasons, following students at Degrassi Community School.

Degree

In mathematics, degree is a numerical measure of size or complexity, most familiarly a polynomial's highest total exponent, also naming the angle unit of 1/360 of a rotation.

Degree (angle)

The degree, also known as the degree of arc, is a unit of angular measure in which a full rotation is 360 degrees; one degree equals π/180 radians.

Degree (graph theory)

Degree (also vertex degree) is a graph theory measure of how many edges meet at a vertex; it underlies the handshaking lemma and degree centrality in networks.

Degree (music)

Degree (music), or scale degree: the numbered position (1–7) of a note within a scale counted from the tonic; named tonic through leading note; relative notation behind movable-do solfège and Roman-numeral harmony, distinct from fixed pitch.

Degree day

A degree day measures how cold or warm a location is, comparing daily mean temperature to a base of 65°F; heating, cooling, and growing degree days track energy use and crops.

Degree of a polynomial

The degree of a polynomial, or polynomial degree, is the largest exponent with a nonzero coefficient among its terms, naming it linear, quadratic, cubic, and so on.

Degree of branching

The degree of branching is a dimensionless measure of how closely a hyperbranched polymer approaches the fully branched structure of a dendrimer, from 0 to 1.

Degree of coherence

The degree of coherence is a normalized correlation measure of how strongly a light field's phase and amplitude at two space-time points relate; its magnitude gives interference fringe visibility.

Degree of esterification

The degree of esterification (DE), also called the degree of methylesterification, is the percentage of pectin's carboxyl groups that are esterified; above 50% is high-methoxyl pectin.

Degree of hydrolysis

Degree of hydrolysis (DH) measures how far a hydrolysis reaction has proceeded: the percentage of acetate groups converted in poly(vinyl alcohol), or of peptide bonds cleaved in protein hydrolysates.

Degree of polarization

The degree of polarization (DOP) is a dimensionless measure, between 0 and 1, of how completely a beam of light is polarized, computed from the Stokes parameters.

Degree of polymerization

The degree of polymerization, or polymerization degree, is the number of monomeric units in a polymer chain, almost always reported as an average tied to molar mass.