toadstone
plural of mamluke
A small stone, once believed to be a jewel embedded in the head of a toad, worn as an amulet.
(algebraic topology) A continuous mapping satisfying the homotopy lifting property with respect to any space.
(idiomatic) To understand, at least on some basic or general level.
彼女は革紐に、ヒキガエルの頭に埋まっている宝石だと信じられ、護符として用いられた小さな石を通して身につけ、病気から守ってくれると信じていた。
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