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| pertaining to or affecting the heart and blood vessels |
| the system by which oxygen is taken into the body; in mammals the system includes the nasal passages, pharynx, trachea, bronchi, and lungs |
| lacrimal duct | |
| —n | |
| Nontechnical name: tear duct a short tube in the inner corner of the eyelid through which tears drain into the nose | |
lacrimal duct n.
A curved canal beginning at the margin of each eyelid near the medial commissure, and emptying with the duct from the other eye into the lacrimal sac. Also called lacrimal canal.