21-letter words containing m, a, r, c, h, l
- multichannel analyser — an electronic instrument, such as a pulse height analyser, that splits an input waveform into a large number of channels in accordance with a particular parameter of the input
- pneumoencephalography — encephalography.
- privacy enhanced mail —
- programmed cell death — a normal, genetically regulated process leading to the death of cells and triggered by the presence or absence of certain stimuli, as DNA damage.
- psychological primary — one of a set of perceived colours (red, yellow, blue, green, black, and white) that can be used to characterize all other perceived colours
- replacement algorithm — The method used to determine which entry in an associative cache to flush to main memory when it is desired to cache a new block of data. The "least recently used" algorithm flushed the block which has not been accessed for the longest time. A random replacement algorithm picks any block with equal probability.
- roman catholic church — the Christian church of which the pope, or bishop of Rome, is the supreme head.
- secure hash algorithm —
- slatwall merchandiser — A slatwall merchandiser is a three-dimensional display unit with grooves cut into its surface into which metal hanging rails can be fixed at various heights.
- splice the main brace — to join together or unite (two ropes or parts of a rope) by the interweaving of strands.
- thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
- trichloronitromethane — chloropicrin.
- william the conqueror — ("the Conqueror") 1027–87, duke of Normandy 1035–87; king of England 1066–87 (son of Robert I, duke of Normandy).