-stat

-stat
comb. form forming nouns with ref. to keeping fixed or stationary (rheostat).
Etymology: Gk statos stationary

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\\ˌstat, usu -ad.+V\ noun combining form (-s)
Etymology: New Latin -stata, from Greek -statēs one that causes to stand, from the stem of histanai to cause to stand — more at stand
1. : apparatus or agent for keeping (something specified) stable or stationary

gyrostat

2. : device for regulating or for maintaining (something specified) in a constant state

cryostat

rheostat

thermostat

3. : instrument for reflecting (something specified) constantly in one direction

heliostat

siderostat

4. : device for studying (something specified) in a state of rest

hydrostat

5. : agent causing inhibition of growth without destruction

bacteriostat

fungistat

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a combining form used in the names of devices that stabilize or make constant what is specified by the initial element: thermostat; rheostat.
[ < Gk -states, equiv. to sta- (s. of histánai to make stand; see STAND) + -tes agent n. suffix]

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-stat /-stat/
combining form
Designating a regulating device that causes something to remain constant or stationary, as in barostat, hygrostat, thermostat
ORIGIN: Gr -statēs causing to stand, from histanai to cause to stand

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combining form.
1. a mechanical device or instrument that causes something to be or become stable, as in rheostat, and thermostat.
2. any regulating, stabilizing, or controlling center, agent, or device, as in appestat.
╂[probably < Greek -státēs, a noun agent suffix < sta-, a root of histánai cause to stand, or stop]
stat.,
1. a) statuary. b) statue.
2. a) statute (miles). b) statute or statutes.

* * *

comb. form denoting instruments, substances, etc., maintaining a controlled state

thermostat | hemostat

Origin:
partly from (helio)stat, partly a back-formation from static

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-stat
the terminal element in certain names of scientific instruments, aerostat, heliostat, hydrostat, klinostat, thermostat. The earliest example of this formation is heliostat, ad. mod.L. hēliostata ('s Gravesande a 1742), app. repr. an assumed Gr. type *ἡλιοστάτης (cf. ὑδροστάτης hydrostatic balance), intended to mean an instrument for causing the sun to appear stationary, f. ἥλιο-ς sun + -στατης agent-n. f. στα- root of ἱστάναι to cause to stand, set. This word is directly imitated in siderostat (hybrid, f. L. sīder- star). The F. aérostat (whence Eng. aerostat) may be a back-formation from aérostatique (formed after hydrostatique), but owes its form to the example of héliostat. The later words have been formed on the analogy of heliostat, app. with some reference to the Gr. στατός standing, stationary, which is given in Fr. and Eng. dicts. as the source of the ending.

Useful english dictionary. 2012.

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