The Collaborative International Dictionary of English v.0.48:

Secern \Se*cern"\, v. t. [imp. & p. p. Secerned; p. pr. & vb.
   n. Secerning.] [L. secernere. See Secrete.]
   1. To separate; to distinguish.
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            Averroes secerns a sense of titillation, and a sense
            of hunger and thirst.                 --Sir W.
                                                  Hamilton.
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   2. (Physiol.) To secrete; as, mucus secerned in the nose.
      --Arbuthnot.
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