reckoner

n device or table (of figures, etc) used as an aid to reckoning 计算器; 计算表. Cf 参看 ready reckoner (ready).

recipient, recipients, reciprocal, reciprocal pronoun, reciprocally, reciprocate, reciprocating, reciprocating engine, reciprocation, reciprocity, recital, recitation, recitative, recite, reckless, recklessly, recklessness, reckon, reckon on, reckon with, reckoning, reclaim, reclamation, recline, recluse, reclusive, recognise, recognition, recognizable, recognizable, recognisable, recognizably, recognisably, recognizance, recognisance, recognize, recognize, recognise, recoil, recollect, recollection, recombine, recommend, recommendable,