delta

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.

Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.

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del·ta (Δ),

(del'tă),

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

Farlex Partner Medical Dictionary © Farlex 2012

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.

Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

δ,

Δ

Abbreviation for delta; diopter.

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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.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Δ

, δ

1. Fourth letter of the Greek alphabet, delta.

2. anatomy a triangular surface.

Medical Dictionary for the Dental Professions © Farlex 2012