Emily Dickinson Lexicon

SPIR'A-CLE, n. [L. spiraculum, from spiro, to breathe.]

1. A small aperture in animal and vegetable bodies, by which air or other fluid is exhaled or inhaled; a small hole, orifice or vent; a pore; a minute passage; as, the spiracle of the human skin.
2. Any small aperture, hole or vent. – Woodward.