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delta

 [del´tah]
1. the fourth letter of the Greek alphabet, Δ or δ; used in chemical names to denote the fourth of a series of isomeric compounds or the carbon atom fourth from the carboxyl group, or to denote the fourth of any series.
2. a triangular area.

Δ

1. Fourth letter of the Greek alphabet, delta.
2. In chemistry, denotes a double bond, usually with a superscript to indicate position in a chain (Δ5), application of heat in a reaction (A B), absence of heat treatment (), distance between two atoms in a molecule, or position of a substituent located on the fourth atom from the carboxyl or other primary functional group (δ); change (Δ); thickness (δ); chemical shift in NMR (δ).
3. anatomy a triangular surface.

del·ta (Δ),

(del'tă),
1. Fourth letter of the Greek alphabet, Δ (capital), δ (lower case).

δ

/δ/ (delta, the fourth letter of the Greek alphabet) heavy chain of IgD; δ chain of hemoglobin.

delta

/del·ta/ (delt´ah)
1. the fourth letter of the Greek alphabet; see also δ-.
2. a triangular area.

delta

[del′tə]
Δ, δ, fourth letter of the Greek alphabet.

YY1

A gene on chromosome 14q that encodes a ubiquitous transcription factor belonging to the GLI-Kruppel class of zinc finger proteins, which directs histone deacetylases or histone acetyltransferases to myriad promoters activating or repressing their activity, implicating histone modification in YY1 activity.

δ,

Δ
Abbreviation for delta; diopter.

del·ta

(Δ, δ) (del'tă)
1. Fourth letter of the Greek alphabet.
2. chemistry A double bond, usually with a superscript to indicate position in a chain (Δ5); application of heat in a reaction (A B); absence of heat treatment (Δ); distance between two atoms in a molecule, or position of a substituent located on the fourth atom from the carboxyl or other primary functional group (δ); change (Δ); thickness (δ); chemical shift in NMR (δ).
3. anatomy A triangular surface.

delta,

n a Greek letter symbolized by upper case Δ or lower case δ. See also Greek letters.

Δ

, δ
1. Fourth letter of the Greek alphabet, delta.
2. anatomy a triangular surface.

delta

1. the fourth letter of the Greek alphabet, Δ or δ; used in chemical names to denote the fourth of a series of isomeric compounds or the carbon atom fourth from the carboxyl group, or to denote the fourth of any series.
2. a triangular area.

delta T lymphocyte
see T lymphocyte.
References in periodicals archive ?
The affiliated Delta Dental Plans of Pennsylvania, New York and West Virginia announced today the award of more than $125,000 during 2003 in support of community dental clinics and programs that serve the working poor.
Nine of the grants are to Pennsylvania-based clinics, where Delta Dental of Pennsylvania covers nearly 2 million enrollees, including 19,000 children of low income families enrolled in the Pennsylvania Children's Health Insurance Program.
In addition, Caledonia identified three paleo deltas of the Coppermine river that stretch from the coast to 80 kilometres up river.
To protect its citizens, employees, assets and facilities, the Florida Management Services Department is implementing Delta Scientific's high security surface mounted barricades and plan to add decorative bollards in a later phase, to guard entrances at the Florida State Capitol Building from vehicle assault.