| acathexis | (noun) (psychoanalysis) a lack of cathexis; a condition in which significant objects or memories arouse no emotion in an individual | - |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| 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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| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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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 | - |
| catalexis | (noun) the absence of a syllable in the last foot of a line or verse | - |
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| cathexis | (noun) (psychoanalysis) the libidinal energy invested in some idea or person or object | Synonyms: charge |
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| chemotaxis | (noun) movement by a cell or organism in reaction to a chemical stimulus | - |
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| deixis | (noun) the function of pointing or specifying from the perspective of a participant in an act of speech or writing; aspects of a communication whose interpretation depends on knowledge of the context in which the communication occurs | - |
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| epiplexis | (noun) a rhetorical device in which the speaker reproaches the audience in order to incite or convince them | - |
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| epistaxis | (noun) bleeding from the nose | Synonyms: nosebleed |
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| hypozeuxis | (noun) use of a series of parallel clauses (as in `I came, I saw, I conquered') | - |
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| lexis | (noun) all of the words in a language; all word forms having meaning or grammatical function | - |
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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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| onyxis | (noun) toenail having its free tip or edges embedded in the surrounding flesh | Synonyms: ingrown toenail |
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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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| pyxis | (noun) a small box used by ancient Greeks to hold medicines | - |
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| (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released | Synonyms: pyxidium |
| stylostixis | (noun) treatment of pain or disease by inserting the tips of needles at specific points on the skin | Synonyms: acupuncture |
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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 | - |