horizon

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Related to radar horizon: Over the horizon radar

horizon

 [hŏ-ri´zon]
a specific anatomic stage of embryonic development, of which 23 have been defined, beginning with the unicellular zygote (fertilized egg) and ending 7 to 9 weeks later with the beginning of the fetal stage.

horizon

any layer of soil that is distinguishable when soil is examined in vertical sections.
References in periodicals archive ?
(6.) Since most radar signals travel in a straight line, this means that a receiver beyond the radar horizon cannot detect a transmitter.
"Correlating overlapping radar can be done, you just need to adjust the update rate." But the E-2C or AWACS may see a track that is not within a ship's radar horizon, for example.
But now that China has apparently developed multiple warhead technology (perhaps, in part, through spying), a TMD system could be inexpensively overwhelmed by multipie-warhead Chinese missiles and probably also by cruise missiles flying below the radar horizon of the TMD system.