Emily Dickinson Lexicon

castle, n. [taken into Eng. two different times: (1) before A.D. 1000 < L. castell-um < Gk κώμη, village; (2) A.D. 1050-1070 ONFr 'castle' < L. castellum, fort, fortress.] (webplay: above).

1. Dwelling; [fig.] world.
2. Body; [fig.] consciousness; spirit.
3. Fortress; palace; [fig.] grave; tomb.