reckoner

1. 240. At the neck of the wrecked deck, the reckoner checked the opaque cheque.
   240.在遭破坏的甲板的颈部，计算者检查了这张不透明支票。
2. The cool-headed reckoner is the stern chastiser of the ecstatic visionary.
   头脑冷静的计算者，是梦想家的严厉惩罚人。
3. Archimedes '"The Sand-Reckoner" and Expression of Large Numbers
   阿基米德《数沙者》与大数记法

noun

1. a handbook of tables used to facilitate computation

   Synonym:    ready reckoner

2. an expert at calculation (or at operating calculating machines)

   Synonym:    calculatorfigurerestimatorcomputer