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| the transparent anterior part of the external coat of the eye covering the iris and the pupil and continuous with the sclera |
| the system by which oxygen is taken into the body; in mammals the system includes the nasal passages, pharynx, trachea, bronchi, and lungs |
cisterna cis·ter·na (sĭ-stûr'nə)
n. pl. cis·ter·nae (-nē')
A cavity or enclosed space serving as a reservoir, especially for chyle, lymph, or cerebrospinal fluid.
An ultramicroscopic space or channel occurring between the membranes of the flattened sacs of the endoplasmic reticulum, the Golgi complex, or the two membranes of the nuclear envelope.