subdetection en · ADJ
Etymology
From sub- + detection.
Meanings
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(not-comparable, rare) Below the threshold of what can be detected.
“These pests can be there at subdetection levels for years if not decades,” said Mr. Carey, who worked on the medfly infestation.
2007 June 18, Jesse Mckinley, “Tiny but Hungry, Moth May Peril California Crops”, in New York Times: