| argon | (noun) a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere | Synonyms: Ar, atomic number 18 |
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| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| argonon | (noun) any of the chemically inert gaseous elements of the helium group in the periodic table | Synonyms: inert gas, noble gas |
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| ergonomics | (noun) the branch of engineering science in which biological science is used to study the relation between workers and their environments | Synonyms: bioengineering, biotechnology |
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| ergonovine | (noun) an alkaloid derived from ergot (trade name Ergotrate Maleate) that is less toxic than ergot; induces muscular contraction of the uterus and is administered after childbirth or abortion | Synonyms: Ergotrate Maleate |
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| gorgonian | (noun) corals having a horny or calcareous branching skeleton | Synonyms: gorgonian coral |
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| gorgonzola | (noun) Italian blue cheese | - |
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| jargon | (noun) a characteristic language of a particular group (as among thieves) | Synonyms: argot, cant, lingo, patois, slang, vernacular |
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| (noun) specialized technical terminology characteristic of a particular subject | - |
| (noun) a colorless (or pale yellow or smoky) variety of zircon | Synonyms: jargoon |