crater of eternal darkness
(zoology) Any member of the order Sphenodontida or of the Sphenodontidae, the only family in the order with living species (tuataras in the genus Sphenodon).
(ecclesiastical) a celibate priest or monk of the Armenian Apostolic Church, a hieromonk
(space science) A crater or other depression, on a solid, non-luminous celestial body, the interior of which contains one or more points which lie in perpetual shadow due to a combination of high latitude and being on a celestial body with low axial tilt.
(mathematics) A diagram obtained by filling in the boxes of the Young diagram with symbols from some alphabet, usually required to be a totally ordered set.
技術者たちは、内部の一部が高緯度かつ軸の傾きが小さいため永久に陰になる極付近の陥没地（永久に陰になるクレーター）にロボット探査機を送り、その中に閉じ込められた水氷を探す計画を立てた。
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