23-letter words containing d, a, r, c, y
- quantum electrodynamics — the quantum field theory that deals with the electromagnetic field and its interaction with electrons and positrons. Abbreviation: QED.
- quantum flavourdynamics — a gauge theory of the electromagnetic and weak interactions
- real simple syndication — (spelling) Illiterate form of Really Simple Syndication.
- right circular cylinder — a cylinder generated by the revolution of a rectangle about one of its sides.
- rsa data security, inc. — (cryptography, company) (After Rivest, Shamir, Adleman - see RSA) A recognised world leader in cryptography, with millions of copies of its software encryption and authentication installed and in use worldwide. RSA's technologies are the global de facto standard for public key cryptography and digital signatures, and are part of existing and proposed standards for the Internet, ITU-T, ISO, ANSI, PKCS, IEEE and business and financial networks around the world.
- secondary modern school — (formerly) a secondary school offering a more technical or practical and less academic education than a grammar school
- secondary seventh chord — a chord formed by superposition of three thirds upon any degree of the scale except the dominant.
- secondary sex character — any of a number of manifestations, as development of breasts or beard, muscularity, distribution of fat tissue, and change of pitch in voice, specific to each sex and incipient at puberty but not essential to reproduction.
- security association id — (networking) (SAID) A 32-bit field added to packet headers for encryption and authentication in the proposed Internet Protocol Version 6.
- social democratic party — History/Historical. a political party in Germany advocating a form of social organization based on the economic and political ideology of Karl Marx.
- state coordinate system — a system of right-angled planar coordinates established by the U.S. Coast and Geodetic Survey for each state in the United States.
- transcendental analytic — (in transcendental logic) the study of the means by which the mind categorizes data from the sensory manifold.
- ventricular tachycardia — a cardiac arrhythmia in which the muscles of the ventricles contract irregularly in a rapid, uncoordinated manner, impairing the normal pumping of blood.
- yellow-headed blackbird — a North American blackbird, Xanthocephalus xanthocephalus, having a yellow head.