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1-20 of 20 possibilities

abnormally large amount of this fetoprotein in the fetus can signal an abnormality of the neural tube (as spina bifida or anencephaly) AFP , alpha fetoprotein , alpha foetoprotein
warning signal that begins an period of preparation for an enemy air attack air alert
warning signal alarm
automatic signal (usually a sound) warning of danger alarm , alarum , alert , warning signal
distress signal alarm , broadcast , flag , flares , mayday , siren , SOS
danger signal alarum
signal (usually a siren) that danger is over all clear
amount of increase in signal power or voltage or current expressed as the ratio of output to input amplification , gain
distortion that occurs when the output signal does not have a linear relation to the input signal amplitude distortion , nonlinear distortion
instantly at a given signal at the drop of a hat
electrical device for attenuating the strength of an electrical signal attenuator
audible part of a transmitted signal audio , sound
extraneous noise contaminating sound measurements that cannot be separated from the desired signal background noise , ground noise
large outdoor fire that is lighted as a signal or in celebration balefire , bonfire
light, signal beacon , Bengal light , flare , lighthouse , Very light
signal light beacon , Bengal light , flare , Very lights , warning light
radio station that broadcasts a directional signal for navigational purposes beacon , radio beacon
radio signal used to guide beam
signal transmitted along a narrow path; guides pilots in darkness or bad weather beam , radio beam
short high tone produced as a signal or warning beep , bleep
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