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also ti·ro (tī′rō)
n. pl. ty·ros also ti·ros
A beginner in learning something.

[Medieval Latin tȳrō, squire, variant of Latin tīrō, recruit.]


(Astronautics) one of a series of US weather satellites carrying infrared and television camera equipment for transmitting meteorological data to the earth
[C20: from T(elevision and) I(nfra-)R(ed) O(bservation) S(atellite)]
References in periodicals archive ?
Part 2 of our animated timeline picks up where Part 1 left off -- with the launch of the TIROS weather satellite.
The new satellite, designated NOAA-19 when it reached orbit, is the final spacecraft in the TIROS series.
Today, a fleet of geostationary (hovering at a fixed point above the equator) and polar-orbiting (traveling from pole to pole) satellites-- including a more recent, 2,288-pound TIROS, which sent back the picture at left-- provides not only an almost continuous view of weather patterns all over the globe, but also a flood of other data including vegetation cover on land, oceanic and atmospheric temperatures and particle activity surrounding the earth.