| anaphylaxis | (noun) hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance | - |
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| ataraxis | (noun) the absence of mental stress or anxiety | Synonyms: heartsease, peace, peace of mind, peacefulness, repose, serenity |
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| axis | (noun) the center around which something rotates | Synonyms: axis of rotation |
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| (noun) the 2nd cervical vertebra; serves as a pivot for turning the head | Synonyms: axis vertebra |
| (noun) a straight line through a body or figure that satisfies certain conditions | - |
| (noun) a group of countries in special alliance | Synonyms: bloc |
| (noun) the main stem or central part about which plant organs or plant parts such as branches are arranged | - |
| chemotaxis | (noun) movement by a cell or organism in reaction to a chemical stimulus | - |
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| epistaxis | (noun) bleeding from the nose | Synonyms: nosebleed |
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| morphallaxis | (noun) regeneration on a reduced scale of a body part; observed especially in invertebrates such as certain lobsters | - |
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| parapraxis | (noun) a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc. | Synonyms: miscue, slip-up, slip |
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| praxis | (noun) translating an idea into action | Synonyms: practice |
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| prophylaxis | (noun) the prevention of disease | - |
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| taxis | (noun) a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism | - |
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| (noun) the surgical procedure of manually restoring a displaced body part | - |