| axolemma | (noun) outer membrane covering an axon | - |
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| axolotl | (noun) larval salamander of mountain lakes of Mexico that usually lives without metamorphosing | Synonyms: Ambystoma mexicanum, mud puppy |
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| axon | (noun) long nerve fiber that conducts away from the cell body of the neuron | Synonyms: axone |
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| axone | (noun) long nerve fiber that conducts away from the cell body of the neuron | Synonyms: axon |
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| ceftriaxone | (noun) a parenteral cephalosporin (trade name Rocephin) used for severe infection of the lungs or throat or ears or urinary tract | Synonyms: Rocephin |
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| claxon | (noun) a kind of loud horn formerly used on motor vehicles | Synonyms: klaxon |
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| klaxon | (noun) a kind of loud horn formerly used on motor vehicles | Synonyms: claxon |
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| saxophone | (noun) a single-reed woodwind with a conical bore | Synonyms: sax |
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| saxophonist | (noun) a musician who plays the saxophone | Synonyms: saxist |
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| taxon | (noun) animal or plant group having natural relations | Synonyms: taxonomic category, taxonomic group |
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| taxonomer | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: systematist, taxonomist |
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| taxonomist | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: systematist, taxonomer |
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| taxonomy | (noun) practice of classifying plants and animals according to their presumed natural relationships | - |
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| (noun) (biology) study of the general principles of scientific classification | - |
| (noun) a classification of organisms into groups based on similarities of structure or origin etc | - |