The Collaborative International Dictionary of English v.0.48:

Cud \Cud\ (k[u^]d), n. [AS. cudu, cwudu,cwidu,cweodo, of
   uncertain origin; cf, G. k["o]der bait, Icel. kvi[eth]r womb,
   Goth. qi[thorn]us. Cf. Quid.]
   1. That portion of food which is brought up into the mouth by
      ruminating animals from their first stomach, to be chewed
      a second time.
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            Whatsoever parteth the hoof, and is cloven-footed,
            and cheweth the cud, among the beasts, that shall ye
            eat.                                  --Levit. xi. 3
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   2. A portion of tobacco held in the mouth and chewed; a quid.
      [Low]
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   3. The first stomach of ruminating beasts. --Crabb.
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   To chew the cud, to ruminate; to meditate; used with of;
      as, to chew the cud of bitter memories.
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            Chewed the thrice turned cud of wrath. --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

chew \chew\ (ch[udd]), v. t. [imp. & p. p. Chewed (ch[udd]d);
   p. pr. & vb. n. Chewing.] [As ce['o]wan, akin to D. kauwen,
   G. kauen. Cf. Chaw, Jaw.]
   1. To bite and grind with the teeth; to masticate.
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   2. To ruminate mentally; to meditate on.
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            He chews revenge, abjuring his offense. --Prior.
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   To chew the cud, to chew the food over again, as a cow; to
      ruminate; hence, to meditate.
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            Every beast the parteth the hoof, and cleaveth the
            cleft into two claws, and cheweth the cud among the
            beasts, that ye shall eat.            --Deut. xxiv.
                                                  6.
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