knothole

n.

（木板等的）节孔；

Knothole, a new side-well gamma ray detector
Operation UPSHOT-KNOTHOLE, 1953
Tube and Tube Knothole Connect with Each Other
An unusual substrate for knothole moss, Anacamptodon splachnoides.
Analysis of UPSHOT-KNOTHOLE 1 (ANNIE) radiological and meteorological data
Print to make the Electric Circuit Knothole Design Technique
Transport of atomic debris from Operation Upshot-Knothole
Analysis of Operation UPSHOT-KNOTHOLE nuclear test NANCY radiological and meteorological data
The habitat of knothole moss anacamptodon splachnoides in the Prats-de-Mollo-La Preste Protected Area (Pyrenées-Orientales, France)
Shots ANNIE to RAY, the first five tests of the UPSHOT-KNOTHOLE Series, 17 March11 April 1953. Technical report