| capillaries | <anatomy> The smallest vessels which contain oxygenated blood. The capillaries, allowing red blood cells to travel in single file, are responsible for delivering oxygen to the tissues on a cellular level. (16 Dec 1997) |
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| sheathed | 1. Povided with, or inclosed in, sheath. 2. <botany> Invested by a sheath, or cylindrical membranaceous tube, which is the base of the leaf, as the stalk or culm in grasses; vaginate. Source: Websters Dictionary (01 Mar 1998) |
| sheathed artery | <anatomy, artery> A subdivision of the penicillus of the spleen surrounded by macrophages and a reticular stroma. (05 Mar 2000) |