secern

verb5

1. •
   (literary) to separate from other people or things
2. •
   (literary) to distinguish one thing from others in the mind
3. •
   (literary, rare) to produce and release a substance such as sweat or saliva from a gland or other organ of the body, to secrete

   • […] Birds bee commonly better Meat than Beasts, because their Flesh doth assimilate more finely, and secerneth more subtilly. — 1631
4. •
   (literary, no longer used) To separate or set apart (someone or something from other persons or things).
5. •
   (literary, no longer used) Synonym of secrete (“to extract or separate (a substance) from the blood, etc., for excretion or for the fulfilling of a physiological function”).