| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| coleus | (noun) any of various Old World tropical plants of the genus Coleus having multicolored decorative leaves and spikes of blue flowers | Synonyms: flame nettle |
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| ileus | (noun) blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel | Synonyms: intestinal obstruction |
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| malleus | (noun) the ossicle attached to the eardrum | Synonyms: hammer |
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| nucleus | (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction | Synonyms: cell nucleus, karyon |
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| (noun) any histologically identifiable mass of neural cell bodies in the brain or spinal cord | - |
| (noun) the central structure of the lens that is surrounded by the cortex | Synonyms: lens nucleus |
| (noun) a small group of indispensable persons or things | Synonyms: core, core group |
| (noun) the positively charged dense center of an atom | - |
| (noun) (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail | - |
| pileus | (noun) a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom | Synonyms: cap |
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| pronucleus | (noun) the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote | - |
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| soleus | (noun) a broad flat muscle in the calf of the leg under the gastrocnemius muscle | Synonyms: soleus muscle |
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