| butadiene | (noun) a gaseous hydrocarbon C4H6; used in making synthetic rubbers | - |
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| catadromous | (adjective) migrating from fresh water to the sea to spawn | - |
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| citadel | (noun) a stronghold into which people could go for shelter during a battle | Synonyms: bastion |
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| conquistador | (noun) an adventurer (especially one who led the Spanish conquest of Mexico and Peru in the 16th century) | - |
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| contadino | (noun) an Italian farmer | - |
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| cyproheptadine | (noun) an antihistamine (trade name Periactin) used to treat some allergic reactions | Synonyms: Periactin |
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| darmstadtium | (noun) a radioactive transuranic element, with atomic number 110 | Synonyms: atomic number 110, Ds, element 110 |
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| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
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| matador | (noun) the principal bullfighter who is appointed to make the final passes and kill the bull | - |
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| metadata | (noun) data about data | - |
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| octad | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octet, octonary, ogdoad, VIII |
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| pentad | (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, Phoebe, quint, quintet, quintuplet, V |
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| pintado | (noun) large edible mackerel of temperate United States coastal Atlantic waters | Synonyms: cero, kingfish, Scomberomorus regalis |
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| rhodomontade | (noun) vain and empty boasting | Synonyms: bluster, braggadocio, rodomontade |
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| rodomontade | (noun) vain and empty boasting | Synonyms: bluster, braggadocio, rhodomontade |
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| staddle | (noun) a base or platform on which hay or corn is stacked | - |
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| stadium | (noun) a large structure for open-air sports or entertainments | Synonyms: arena, bowl, sports stadium |
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| tad | (noun) a slight amount or degree of difference | Synonyms: shade |
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| tadalafil | (noun) virility drug (trade name Cialis) used to treat erectile dysfunction in men | Synonyms: Cialis |
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| tadpole | (noun) a larval frog or toad | Synonyms: polliwog, pollywog |
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| tostada | (noun) a flat tortilla with various fillings piled on it | - |
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| (noun) a crisp flat tortilla | - |