| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| aerodynamic | (adjective) of or relating to aerodynamics | - |
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| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: flowing, sleek, streamlined |
| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| erode | (verb) remove soil or rock | Synonyms: eat away, fret |
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| (verb) become ground down or deteriorate | Synonyms: eat at, gnaw, gnaw at, wear away |
| eroded | (adjective) worn away as by water or ice or wind | Synonyms: scoured |
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| eroding | (noun) (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively | Synonyms: eating away, erosion, wearing, wearing away |
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| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| heterodox | (adjective) characterized by departure from accepted beliefs or standards | Synonyms: dissident, heretical |
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| heterodoxy | (noun) the quality of being unorthodox | Synonyms: unorthodoxy |
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| (noun) any opinions or doctrines at variance with the official or orthodox position | Synonyms: heresy, unorthodoxy |
| heterodyne | (adjective) of or relating to the beat produced by heterodyning two oscillations | - |
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| (verb) combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two | - |
| pterodactyl | (noun) extinct flying reptile | - |
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| scleroderma | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: dermatosclerosis |
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| xeroderma | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xerodermia |
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| xerodermia | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xeroderma |
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