| astrodome | (noun) a transparent dome on top of an airplane where the navigator can make celestial observations | - |
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| astrodynamics | (noun) the branch of astronomy that studies the motion of natural and artificial bodies in space | - |
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| dimetrodon | (noun) carnivorous dinosaur of the Permian in North America having a crest or dorsal sail | - |
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| downtrodden | (adjective) abused or oppressed by people in power | - |
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| ectrodactyly | (noun) congenital abnormality involving the absence of some fingers or toes | - |
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| electrode | (noun) a conductor used to make electrical contact with some part of a circuit | - |
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| electrodeposition | (noun) the deposition of a substance on an electrode by the action of electricity (especially by electrolysis) | - |
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| electrodynamometer | (noun) measuring instrument that uses the interaction of the magnetic fields of two coils to measure current or voltage or power | - |
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| gastroduodenal | (adjective) of or relating to the stomach and the duodenum | - |
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| introduce | (verb) be a precursor of | Synonyms: inaugurate, usher in |
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| (verb) place, fit, or thrust (something) into another thing | Synonyms: enclose, inclose, insert, put in, stick in |
| (verb) put before (a body) | - |
| (verb) cause to come to know personally | Synonyms: acquaint, present |
| (verb) furnish with a preface or introduction | Synonyms: precede, preface, premise |
| (verb) bring before the public for the first time, as of an actor, song, etc. | Synonyms: bring out |
| (verb) put or introduce into something | Synonyms: enter, infix, insert |
| (verb) bring something new to an environment | Synonyms: innovate |
| (verb) bring in or establish in a new place or environment | - |
| (verb) bring in a new person or object into a familiar environment | Synonyms: bring in |
| introduction | (noun) the act of putting one thing into another | Synonyms: insertion, intromission |
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| (noun) the act of beginning something new | Synonyms: debut, entry, first appearance, launching, unveiling |
| (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, institution, origination |
| (noun) the first section of a communication | - |
| (noun) formally making a person known to another or to the public | Synonyms: intro, presentation |
| (noun) a basic or elementary instructional text | - |
| (noun) a new proposal | - |
| introductoriness | (noun) The quality of being introducing; of giving a preview or idea of. | - |
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| introductory | (adjective) serving as a base or starting point | Synonyms: basic |
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| (adjective) serving to open or begin | - |
| (adjective) serving as an introduction or preface | Synonyms: prefatorial, prefatory |
| reintroduce | (verb) introduce anew | Synonyms: re-introduce |
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| reintroduction | (noun) an act of renewed introduction | - |
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| tetrode | (noun) a thermionic tube having four electrodes | - |
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| tetrodotoxin | (noun) a powerful neurotoxin found in the ovaries of pufferfish | - |
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| untrod | (adjective) lacking pathways | Synonyms: pathless, roadless, trackless, untracked, untrodden |
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| untrodden | (adjective) lacking pathways | Synonyms: pathless, roadless, trackless, untracked, untrod |
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