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There are 20 words ending with OSTAT

AEROSTAT	• aerostat n. An aircraft, such as a dirigible or balloon, that derives its lift from buoyancy rather than from wings or rotors. • aerostat n. A moored balloon flown in a semi-permanent manner, such as a border patrol monitoring balloon affixed… • AEROSTAT n. any lighter-than-air craft e.g. a blimp or balloon, as opposed to an aerodyne.
BACTERIOSTAT	• bacteriostat n. A biological or chemical agent that causes bacteriostasis. • BACTERIOSTAT n. an agent that causes bacteriostasis.
BAROSTAT	• barostat n. A device used to maintain a constant (atmospheric) pressure. • BAROSTAT n. an automatic device for regulating pressure, e.g. in an aircraft.
CHEMOSTAT	• chemostat n. (Biochemistry) An apparatus for the continuous culture of microorganisms in a steady state. • chemostat v. (Chemistry) To keep the concentration of a chemical constant. • CHEMOSTAT n. an apparatus for growing cultures of bacteria etc.
CLINOSTAT	• clinostat n. A rotating device that is used to investigate gravitropism in plants. • CLINOSTAT n. an apparatus for studying tropisms in plants.
COCCIDIOSTAT	• coccidiostat n. Any antiprotozoal agent that acts upon Coccidia parasites. • COCCIDIOSTAT n. an agent which builds up a resistance by the host to coccidia by retarding the latter's life-cycle, etc.
COELOSTAT	• coelostat n. (Astronomy) A device that rotates a telescope so as to keep its orientation constant with relation to the stars. • COELOSTAT n. an astronomical instrument used to reflect light on to a telescope.
CRYOSTAT	• cryostat n. Any device used to maintain a constant low temperature. • cryostat n. (Biology) A microtome held at a constant low temperature. • CRYOSTAT n. a refrigeration apparatus.
GYROSTAT	• gyrostat n. A gyroscope fixed within a rigid case. • GYROSTAT n. a type of stabilising device.
HAEMOSTAT	• haemostat n. (British spelling) A clamp used in surgery to close the severed end of a blood vessel to stop bleeding. • HAEMOSTAT n. an instrument for stopping bleeding, also HEMOSTAT.
HELIOSTAT	• heliostat n. A device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined… • HELIOSTAT n. an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages.
HEMOSTAT	• hemostat n. (Medicine) An instrument that clamps blood vessels to diminish or halt blood flow. • HEMOSTAT n. an instrument for stopping bleeding, also HAEMOSTAT.
HYDROSTAT	• hydrostat n. A mechanism that regulates the amount of water in a boiler. • hydrostat n. (Biology) A muscle tissue, composed mostly of water, that maintains a constant volume during contraction. • HYDROSTAT n. a contrivance or apparatus to prevent the explosion of steam boilers.
HYGROSTAT	• hygrostat n. A device that maintains a constant level of humidity. • HYGROSTAT n. a machine for regulating the humidity of air.
KLINOSTAT	• klinostat n. Alternative form of clinostat. • KLINOSTAT n. a revolving stand for experimenting with growing plants.
PHOTOSTAT	• photostat n. (Dated) A photocopy, especially one made by a Photostat machine. • photostat n. (Malaysia, Philippines) A photocopy made using a photocopier. • photostat n. Positive (black on white) or negative (white on black) reproduction of printed matter or artwork made…
PYROSTAT	• pyrostat n. A thermostat designed to operate at high temperatures. • pyrostat n. An automatic draught-regulator for chimney-stacks, smoke-pipes, etc. • PYROSTAT n. an automatic fire-alarm and extinguisher; a thermostat.
RHEOSTAT	• rheostat n. An electrical resistor, with two terminals, whose resistance is continuously variable by moving a knob or slider. • RHEOSTAT n. a resistor used to control electric current.
SIDEROSTAT	• siderostat n. (Astronomy) A heliostat that may be used with stars as well as the sun. • SIDEROSTAT n. a mirror, or telescope with a mirror, for reflecting the rays of a star in a constant direction.
THERMOSTAT	• thermostat n. A device that automatically responds to changes in temperature by activating a heating or cooling system… • thermostat n. (Physics) An algorithm used to maintain a simulated system at a set temperature by absorbing or releasing heat. • THERMOSTAT v. to provide with or control the temperature of by a thermostat, a device for keeping temperature stead.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 80 words
Scrabble in French: 21 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: 4 words
Scrabble in Romanian: 27 words

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