| exobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: astrobiology, space biology |
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| exocarp | (noun) outermost layer of the pericarp of fruits as the skin of a peach or grape | Synonyms: epicarp |
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| exocrine | (noun) a gland that secretes externally through a duct | Synonyms: duct gland, exocrine gland |
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| exode | (noun) a farcical afterpiece in the ancient Roman theater | - |
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| exoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, ectoderm |
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| exodontia | (noun) the branch of dentistry dealing with extraction of teeth | Synonyms: exodontics |
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| exodontics | (noun) the branch of dentistry dealing with extraction of teeth | Synonyms: exodontia |
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| exodontist | (noun) a dentist specializing in the extraction of teeth | - |
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| exodus | (noun) a journey by a large group to escape from a hostile environment | Synonyms: hegira, hejira |
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| exogamy | (noun) marriage to a person belonging to a tribe or group other than your own as required by custom or law | Synonyms: intermarriage |
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| exogen | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, magnoliopsid |
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| exomphalos | (noun) an umbilical hernia at birth in which some abdominal organs push into the umbilical cord | - |
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| exon | (noun) sequence of a gene's DNA that transcribes into protein structures | Synonyms: coding DNA |
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| exoneration | (noun) the act of vindicating or defending against criticism or censure etc. | Synonyms: vindication |
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| (noun) the condition of being relieved from blame or obligation | - |
| exonuclease | (noun) a nuclease that releases one nucleotide at a time (serially) beginning at one of a nucleic acid | - |
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| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| exoplanet | (noun) A planet which exists outside Earth's solar system | - |
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| exorbitance | (noun) excessive excess | Synonyms: outrageousness |
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| exorciser | (noun) someone who practices exorcism | Synonyms: exorcist |
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| exorcism | (noun) freeing from evil spirits | Synonyms: dispossession |
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| exorcist | (noun) someone who practices exorcism | Synonyms: exorciser |
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| (noun) one of the minor orders in the unreformed Western Church but now suppressed in the Roman Catholic Church | - |
| exordium | (noun) (rhetoric) the introductory section of an oration or discourse | - |
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| exoskeleton | (noun) the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs | - |
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| exosphere | (noun) the outermost atmospheric layer | - |
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| exostosis | (noun) a benign outgrowth from a bone (usually covered with cartilage) | - |
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| exotherm | (noun) a compound that gives off heat during its formation and absorbs heat during its decomposition | - |
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| exoticism | (noun) the quality of being exotic | Synonyms: exoticness, exotism |
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| exoticness | (noun) the quality of being exotic | Synonyms: exoticism, exotism |
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| exotism | (noun) the quality of being exotic | Synonyms: exoticism, exoticness |
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| exotoxin | (noun) a toxin that is secreted by microorganisms into the surrounding medium | - |
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| exotropia | (noun) strabismus in which one or both eyes are directed outward | Synonyms: divergent strabismus, walleye |
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