| aplacental | (adjective) having no placenta | - |
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| aplacophoran | (noun) deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle | Synonyms: solenogaster |
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| aplanatic | (adjective) free from or corrected for spherical aberration | - |
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| aplasia | (noun) failure of some tissue or organ to develop | - |
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| aplite | (noun) light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars | - |
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| aplitic | (adjective) of or related to aplite | - |
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| aplomb | (noun) great coolness and composure under strain | Synonyms: assuredness, cool, poise, sang-froid |
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