| butanol | butanone | butatriene | Butcher–Oemler effect | Bute, John Stuart, 3rd Earl of (1713–92) | 
		| Butenandt, Adolf Friedrich Johann | butene | butenedioic acid | butex process | Buthelezi, Chief Mangosuthu (1928) | 
		| Butler, Joseph (1692–1752) | Butler matrix | Butlerov, Alexander Mikhailovich (1828–86) | Butler, Richard Austen (1902–82) | Butler, Samuel (1835–1902) | 
		| Butler–Volmer equation | butte | buttercup | butterflies | butterfly | 
		| Butterfly Cluster | butterfly diagram | butterfly effect | Butterfly Nebula | butterfly valve | 
		| butterwort | Butterworth filter | button | button mica capacitor | buttress root | 
		| butylene | butyl group | butyl rubber | butyraldehyde | butyric acid | 
		| Buxar, Battle of (22 October 1764) | buyer | buyer concentration | buyer’s market | buy-out | 
		| Buys Ballot, Christoph Hendrik Diederik | Buys Ballot’s law | buzz | buzzard | BV photometry | 
		| BW | BWG | BWR | Bw star | BWTP | 
		| BY Draconis star | Byerlee’s rule | bygones | Bykovsky, Valery Fyodorovich (1934– ) | Byng, George, Viscount Torrington (1663–1733) | 
		| BYOD | by-pass capacitor | bypass capacitor | by-product | Byron, Augusta Ada | 
		| byssate | byssus | byte | byte-addressable | byte code | 
		| byte-order mark | bytownite | Byurakan Astrophysical Observatory | Byzantine empire | Byzantine Generals problem | 
		| Byzantium | BZ | b-zone | Bábism | Bárány, Robert | 
		| Békésy, Georg von | Bénard cell | Bézier curve | Bézier patch | Bézier surface | 
		| Bézout’s lemma | Bézout’s theorem | Böserup model | Bølling | Bølling-Allerød interstadial | 
		| Bülow, Bernard, Prince von (1849–1920) | Bürgi–Dunitz angle | B–Z reaction | C | C# | 
		| C* | C++ | c | C0 | C1 | 
		| C2 | C3 and C4 plants | C3 pathway | C4 pathway | CA | 
		| cabal | Cabana, Robert Donald (1949– ) | Cabanis, Pierre-Jean-Georges (1758–1808) | cabbage tree | cabbage white butterfly | 
		| cabbala | Cabeza de Vaca, Alvar Núñez (c.1490–c.1557) | cabin | cabinet | cable | 
		| cable drilling | cable modem | cable television | cable tester | cabotage | 
		| Cabot, John (c.1450–c.1498) | Cabral, Amilcar (1924–73) | cache | cache hit | cache memory | 
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