Emily Dickinson Lexicon

DIS-CERN'ER, n.

1. One who sees, discovers, or distinguishes; an observer.
2. One who knows and judges; one who has the power of distinguishing. He was a great observer and discerner of men's natures and humors. – Clarendon.
3. That which distinguishes; or that which causes to understand. The word of God is quick and powerful … a discerner of the thoughts and intents of the heart. – Heb. iv.