American Dictionary of the English Language

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SPIR'ACLE, noun [Latin spiraculum, form 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 spiracles of the human skin.

2. Any small aperture, hole or vent.