dripline
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dripline — A line on the ground at a cave entrance formed by drips from the rock above. Useful in cave survey to define the beginning of the cave [25] … Lexicon of Cave and Karst Terminology
lintel line — A line on the ground at a cave entrance perpendicularly beneath the outer edge of the rock above; may or may not coincide with the dripline [25]. See also dripline … Lexicon of Cave and Karst Terminology
Neutron drip line — The neutron drip line is a concept in particle and nuclear physics. An unstable atomic nucleus beyond the neutron drip line will leak free neutrons. In other words, the neutron drip line is the line on the Z, N plane (see table of nuclides) where … Wikipedia
