| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| (noun) a very old person | Synonyms: ancient |
| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| diluent | (noun) a diluting agent | Synonyms: dilutant, thinner |
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| dilutant | (noun) a diluting agent | Synonyms: diluent, thinner |
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| dilute | (adjective) reduced in strength or concentration or quality or purity | Synonyms: diluted |
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| (verb) lessen the strength or flavor of a solution or mixture | Synonyms: cut, reduce, thin, thin out |
| (verb) corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones | Synonyms: adulterate, debase, load, stretch |
| diluted | (adjective) reduced in strength or concentration or quality or purity | Synonyms: dilute |
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| dilution | (noun) weakening (reducing the concentration) by the addition of water or a thinner | - |
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| (noun) a diluted solution | - |
| diluvial | (adjective) of or connected with a deluge | Synonyms: diluvian |
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| diluvian | (adjective) of or connected with a deluge | Synonyms: diluvial |
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| postdiluvian | (adjective) existing or occurring after Noah's flood | - |
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| (noun) anything living after Noah's flood | - |
| undiluted | (adjective) not diluted | - |
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