| Spruce Goose | Spire | Spanish Flu |
| Spanish aircraft carrier Principe de AsturiasThe Principe de Asturias (R 11) is the only active aircraft carrier of the Spanish navy. She is the flagship of the fleet and together with her escort frigates makes up Alpha group. She was built to replace the ageing Dedalo. The carrier air arm is made u | Spindle fiberA spindle fiber is a component fiber (technically, a microtubule) of the mitotic spindle. | SpiritualismSpiritualism is a religion in which contact with the spirits of the dead through a medium is central. Spiritualism in its modern incarnation started in the mid-nineteenth century in the United States and essentially grew out of Christianity. It is still p |
| Spotting scopeA spotting scope is a portable telescope, optimized for the observation of terrestrial objects. The magnification of a spotting scope is typically on the order of 20X to 60X. Other common features include: somewhat "rugged" or rubber-armoured design conve | Spectral densityIn physics, the spectral density or more correctly the power spectral density (PSD) of a given bandwidth of electromagnetic radiation is the total power in this bandwidth divided by the specified bandwidth. Spectral density is usually expressed in watts p | Spherical harmonicPartial differential equations In mathematics, the spherical harmonics are an orthogonal set of solutions to Laplace's equation represented in a system of spherical coordinates. The solutions are generally expressed in terms of trigonometric functions and |
| Sputnik crisisThe Sputnik crisis was a turning point of the Cold War that begun on October 4, 1957 when the Soviet Union launched the Sputnik 1 satellite. The USA had believed itself to be the leader of space technology and thus a leader of missile development. The sur | SpeenhamlandSpeenhamland was an English system of outdoor relief intended to mitigate rural poverty during the early 19th century. It is named after the hamlet of Speen near Newbury in Berkshire, where, in 1795, the authorities approved a means-tested sliding-scale o | Speen, BerkshireSpeen (Roman Spinae is a village on the main Cirencester to Silchester Roman road. Near to Newbury in Berkshire, it was the eponymous home of the Speenhamland system of outdoor relief. Villages in Berkshire. |
| Sponge (band) | Specificity | Split horizon |
| Spui (river) | Spider Robinson | Spoilt Bastard |
| Spectrum of an operator | Spahis | Splendor in the Grass |
| Spirochaete | Spiral galaxy | Span loop |
| Spaceguard | Spina bifida | Spreadeagle |
| Sphenopsalis | Spede Pasanen | Spammism |
| Sparky | Spotted Creeper | Spinifex Hopping Mouse |
| Spitting Image | Space Marines (Warhammer 40,000) | Spritzer |
| Spades | SP Balasubramanyam | Sponsorship |
| Space Is The Place | Spike Island | Speech from the Throne |
| Spike | Split | Spoons |
| Spherocytosis | Spoof | Speed of advance |
| Spoken language | Spriting | Spear of Destiny (video game) |
| Speak | Spot welding | Spiral dynamics |
| Sporadic E propagation | Spend management | Space-like |
| Spaghettisssimo | Spot beam | Spastic |
| Spencer Perceval | Spliceosome | Spencer Walpole |
| Sprechgesang | Spherical Earth | Spencer Cavendish, 8th Duke of Devonshire |
| Spine (biology) | Springfield Township, Hamilton County, Ohio | Sports Night |
| Speyer | Speak of the Devil | Spearman's rank correlation coefficient |
| SpiderWeb Productions | Specified load | Spelling bee |
| Spanish Lookout | Spotted dick | Sputum |
| Speed Racer | Spirit of America | Spencer Abraham |
| Spinal nerve | Sphere of influence | Speedo |
| Sports memorabilia | Spectral envelope | Split Enz |
| Space Needle | Spectral method | SPK (band) |
| Spinlock | SparkNotes | Sphenic number |
| Space 1999, Festival | Spork | Springhill, Nova Scotia |
| Speak of the Devil (Ozzy Osbourne album) | Space charge | Spiderman: The Animated Series |
| SPUSA | Spike TV | Spotless Starling |
| Specialty catalogs | Speculum | Speculum feathers |
