28-letter words containing a, l, d, e, r
- through rose-colored glasses — with optimism, esp. undue optimism
- to leave a lot to be desired — If you say that something leaves a lot to be desired, you mean that it is not as good as it should be.
- united states postal service — an independent federal agency created in 1971 to replace the Post Office Department as the division of the federal government responsible for postal services. Abbreviation: USPS.
- variable-density wind tunnel — a closed-circuit wind tunnel entirely contained in a casing in which the pressure and therefore the density of the working fluid can be maintained at a preselected value
- walden, or life in the woods — a book of philosophical observations (1854) by Thoreau.
- xerox data systems model 530 — (computer) (XDS 530) A computer from the Scientific Data Systems range, announced sometime after 1968 when Xerox bought out SDS. The XDS 530 was probably under development at SDS before the buy-out but only announced afterwards.
- xerox data systems model 940 — (computer) (SDS 940, XDS 940) A time-sharing system, announced in February 1966, developed by Scientific Data Systems with help from The University of California at Berkeley and Tymshare. SDS 940 was backward compatible with SDS's previous systems (except the 12-bit SDS 92). It had monitor and user modes, dynamic program relocation, automatic memory fragmentation, and system protection. After 1968 Xerox bought out SDS and renamed the SDS machines "Xerox Data Systems" (XDS). Xerox then produced the XDS 530.
- zeroth law of thermodynamics — the principle that any two systems in thermal equilibrium with a third system are in thermal equilibrium with each other. Compare law of thermodynamics (def 2).