The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\ (r[=a]"d[i^]*[=a]t), v. i. [imp. & p. p.
   Radiated (r[=a]"d[i^]*[=a]`t[e^]d); p. pr. & vb. n.
   Radiating.] [L. radiatus, p. p. of radiare to furnish with
   spokes or rays, to radiate, fr. radius ray. See Radius,
   Ray a divergent line.]
   1. To emit rays; to be radiant; to shine.
      [1913 Webster]

            Virtues shine more clear
            In them [kings], and radiate like the sun at noon.
                                                  --Howell.
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   2. To proceed in direct lines from a point or surface; to
      issue in rays, as light or heat.
      [1913 Webster]

            Light radiates from luminous bodies directly to our
            eyes.                                 --Locke.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\, v. t.
   1. To emit or send out in direct lines from a point or
      points; as, to radiate heat.
      [1913 Webster]

   2. To enlighten; to illuminate; to shed light or brightness
      on; to irradiate. [R.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\ (r[=a]"d[i^]*[asl]t), a. [L. radiatus, p.
   p.]
   1. Having rays or parts diverging from a center; radiated;
      as, a radiate crystal.
      [1913 Webster]

   2. (Bot.) Having in a capitulum large ray florets which are
      unlike the disk florets, as in the aster, daisy, etc.
      [1913 Webster]

   3. (Zool.) Belonging to the Radiata.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Radiate \Ra"di*ate\, n. (Zool.)
   One of the Radiata.
   [1913 Webster]

WordNet (r) 3.0 (2006):

radiate
    adj 1: arranged like rays or radii; radiating from a common
           center; "radial symmetry"; "a starlike or stellate
           arrangement of petals"; "many cities show a radial
           pattern of main highways" [syn: radial, stellate,
           radiate]
    2: having rays or ray-like parts as in the flower heads of
       daisies
    v 1: send out rays or waves; "The sun radiates heat"
    2: send out real or metaphoric rays; "She radiates happiness"
    3: extend or spread outward from a center or focus or inward
       towards a center; "spokes radiate from the hub of the wheel";
       "This plants radiate spines in all directions" [syn:
       radiate, ray]
    4: have a complexion with a strong bright color, such as red or
       pink; "Her face glowed when she came out of the sauna" [syn:
       glow, beam, radiate, shine]
    5: cause to be seen by emitting light as if in rays; "The sun is
       radiating"
    6: experience a feeling of well-being or happiness, as from good
       health or an intense emotion; "She was beaming with joy";
       "Her face radiated with happiness" [syn: glow, beam,
       radiate, shine]
    7: issue or emerge in rays or waves; "Heat radiated from the
       metal box"
    8: spread into new habitats and produce variety or variegate;
       "The plants on this island diversified" [syn: diversify,
       radiate]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "radiate":
   be bright, beacon, beam, bedazzle, bestrew, blaze, blind,
   broadcast, burn, circulate, circumfuse, coruscate, daze, dazzle,
   deal out, diffract, diffuse, diffuse light, dispense, disperse,
   dispread, disseminate, distribute, diverge, emanate, emit, fan out,
   flame, flare, flash, fulgurate, give light, give off, give out,
   glance, glare, gleam, glint, glisten, glitter, glow, incandesce,
   irradiate, issue, jam, luster, newscast, overscatter, oversow,
   overspread, propagate, publish, radio, radiobroadcast, ray, retail,
   scatter, scintillate, send, send out, send out rays, shed, shimmer,
   shine, shine brightly, shoot, shoot out rays, shortwave, sign off,
   sign on, sow, sow broadcast, sparkle, splay, sportscast, spread,
   spread out, strew, transmit, twinkle, utter, wireless