Emily Dickinson Lexicon

jealous, adj. [OFr gelos < L. < Gk., emulation, zeal, jealousy.] (webplay: God, good, loves).

1. Envious of superior qualities; desirous to obtain for oneself another's advantageous blessings; resentful towards another on account of suspected rivalry; troubled by the suspicion that the good which one wants to gain for oneself may be diverted to another.
2. Tolerating no unfaithfulness; having a love that will put up with no defection in the beloved object.