occult line

English

occult line (plural occult lines)

A line drawn as a part of the construction of a geometrical figure or problem, but not to appear in the finished plan.
- 1854, William Henry Smyth, The Mediterranean: A Memoir Physical, Historical, and Nautical, pp. 136-37 (Google preview):
  Yet in making an occult line on my chart, to indicate this rise from a depth at present beyond estimate, I by no means meant it as a mark for shoal water in which navigation is concerned.

单词	occult line
释义	occult line English Noun occult line (plural occult lines) A line drawn as a part of the construction of a geometrical figure or problem, but not to appear in the finished plan. 1854, William Henry Smyth, The Mediterranean: A Memoir Physical, Historical, and Nautical, pp. 136-37 (Google preview): Yet in making an occult line on my chart, to indicate this rise from a depth at present beyond estimate, I by no means meant it as a mark for shoal water in which navigation is concerned. References occult line at OneLook Dictionary Search
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