Oxford University Press, 2004. — 496 p. — ISBN10: 0195173287.
We all know what the words cat and dog and mother and tree mean. What we really need is a dictionary that helps us with the tough words, like elucubrate, or demesne, or cynosure. True, a standard dictionary can bail us out when we run across a tough word at home or in a library. But we often read elsewhere―in a doctor's waiting room or on a plane, or while on vacation.