| space simulation | An environment simulating one or more parameters of the space environment, applied in testing space systems or components. Often, a closed chamber is used, capable of approximating the vacuum and normal environments of space. This also includes simulated extravehicular activity studies in atmosphere exposure chambers or water tanks. (12 Dec 1998) |
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| space suits | Pressure suits for wear in space or at very low ambient pressures within the atmosphere, designed to permit the wearer to leave the protection of a pressurised cabin. (12 Dec 1998) |
| space-time clustering | A statistically significant excess of cases of a disease, occurring within a limited space-time continuum. (12 Dec 1998) |
| spacecraft | Devices, manned and unmanned, which are designed to be placed into an orbit about the earth or into a trajectory to another celestial body. (12 Dec 1998) |
| spaced teeth | Teeth which have separated and lost proximal contact with adjacent teeth. (05 Mar 2000) |
| spacelate | <medicine> To die, decay, or become gangrenous, as flesh or bone; to mortify. Origin: NL. Sphacelare, sphacelatum, mortify: cf. F. Sphaceler. See Sphacelus. Source: Websters Dictionary (01 Mar 1998) |
| spacer DNA | <molecular biology> The DNA sequence between genes. In bacteria, only a few nucleotides long. In eukaryotes, can be extensive and include repetitive DNA, comprising the majority of the DNA of the genome. The term is used particularly for the spacer DNA between the many tandemly repeated copies of the ribosomal RNA genes. (18 Nov 1997) |
| spaces of iridocorneal angle | Irregularly shaped endothelium-lined spaces within the trabecular reticulum, through which the aqueous filters to reach the sinus venosus sclerae. Synonym: spatia anguli iridocornealis, ciliary canals, Fontana's spaces. (05 Mar 2000) |
| spade | 1. An implement for digging or cutting the ground, consisting usually of an oblong and nearly rectangular blade of iron, with a handle like that of a shovel. "With spade and pickax armed." 2. One of that suit of cards each of which bears one or more figures resembling a spade. ""Let spades be trumps!" she said." (Pope) 3. A cutting instrument used in flensing a whale. Spade bayonet, a bayonet with a broad blade which may be used digging; called also trowel bayonet. 4. <machinery> Spade handle, the forked end of a connecting rod in which a pin is held at both ends. 5. <zoology> A hart or stag three years old. Alternative forms: spaid, spayade. Origin: AS. Spaed; spada; akin to D. Spade, G. Spaten, Icel. Spathi, Dan. & Sw. Spade, L. Spatha a spatula, a broad two-edged sword, a spathe, Gr. Spaqh. Cf. Epaulet, Spade at cards, Spathe, Spatula. (17 Mar 1998) |
| spade fingers | The course, thick finger's of acromegaly or myxoedema. (05 Mar 2000) |
| spade hand | The coarse, thick, square hand of acromegaly or myxoedema. (05 Mar 2000) |
| spadefish | <marine biology> An American market fish (Chaetodipterus faber) common on the southern coasts. Synonym: angel fish, moonfish, and porgy. (17 Mar 1998) |
| spadefoot | <zoology> Any species of burrowing toads of the genus Scaphiopus, especially. S. Holbrookii, of the Eastern United States. Synonym: spade toad. Source: Websters Dictionary (01 Mar 1998) |
| spadiceous | 1. Of a bright clear brown or chestnut colour. 2. <botany> Bearing flowers on a spadix; of the nature of a spadix. Origin: L. Spadix, -icis, a date-brown or nut-brown colour. See Spadix. Source: Websters Dictionary (01 Mar 1998) |
| spadicose | <botany> Spadiceous. Source: Websters Dictionary (01 Mar 1998) |