The Collaborative International Dictionary of English v.0.48:

Seethe \Seethe\, v. t. [imp. Seethed(Sod, obs.); p. p.
   Seethed, Sodden; p. pr. & vb. n. Seething.] [OE.
   sethen, AS. se['o]?an; akin to D. sieden, OHG. siodan, G.
   sieden, Icel. sj??a, Sw. sjuda, Dan. syde, Goth. saubs a
   burnt offering. Cf. Sod, n., Sodden, Suds.]
   To decoct or prepare for food in hot liquid; to boil; as, to
   seethe flesh. [Written also seeth.]
   [1913 Webster]

         Set on the great pot, and seethe pottage for the sons
         of the prophets.                         --2 Kings iv.
                                                  38.
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The Collaborative International Dictionary of English v.0.48:

Sod \Sod\, v. t. [imp. & p. p. Sodden; p. pr. & vb. n.
   Sodding.]
   To cover with sod; to turf.
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The Collaborative International Dictionary of English v.0.48:

Sod \Sod\, n. (Zool.)
   The rock dove. [Prov. Eng.]
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The Collaborative International Dictionary of English v.0.48:

Sod \Sod\, n. [Akin to LG. sode, D. zode, OD. sode, soode,
   OFries. satha, and E. seethe. So named from its sodden state
   in wet weather. See Seethe.]
   That stratum of the surface of the soil which is filled with
   the roots of grass, or any portion of that surface; turf;
   sward.
   [1913 Webster]

         She there shall dress a sweeter sod
         Than Fancy's feet have ever trod.        --Collins.
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The Collaborative International Dictionary of English v.0.48:

Sod \Sod\, obs.
   imp. of Seethe.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sod
    n 1: surface layer of ground containing a mat of grass and grass
         roots [syn: turf, sod, sward, greensward]
    2: an enzyme that catalyzes the conversion of superoxide into
       hydrogen peroxide and oxygen; "oxygen free radicals are
       normally removed in our bodies by the superoxide dismutase
       enzymes" [syn: superoxide dismutase, SOD]
    3: someone who engages in anal copulation (especially a male who
       engages in anal copulation with another male) [syn:
       sodomite, sodomist, sod, bugger]
    4: an informal British term for a youth or man; "the poor sod
       couldn't even buy a drink"
    v 1: cover with sod