| addend | (noun) a number that is added to another number (the augend) | - |
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| addendum | (noun) textual matter that is added onto a publication; usually at the end | Synonyms: postscript, supplement |
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| adder | (noun) small terrestrial viper common in northern Eurasia | Synonyms: common viper, Vipera berus |
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| (noun) a machine that adds numbers | - |
| (noun) a person who adds numbers | - |
| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| bladder | (noun) a bag that fills with air | - |
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| (noun) a distensible membranous sac (usually containing liquid or gas) | Synonyms: vesica |
| bladdernose | (noun) medium-sized blackish-grey seal with large inflatable sac on the head; of Arctic and northern Atlantic waters | Synonyms: Cystophora cristata, hooded seal |
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| bladderpod | (noun) any of several hairy North American herbs having yellow racemose flowers and inflated pods | - |
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| (noun) any of several plants of the genus Physaria having racemose yellow flowers and inflated pods | - |
| (noun) annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella | - |
| (noun) North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic | Synonyms: Indian tobacco, Lobelia inflata |
| bladderwort | (noun) any of numerous aquatic carnivorous plants of the genus Utricularia some of whose leaves are modified as small urn-shaped bladders that trap minute aquatic animals | - |
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| bladderwrack | (noun) a common rockweed used in preparing kelp and as manure | Synonyms: black rockweed, bladder fucus, Fucus vesiculosus, tang |
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| (noun) similar to and found with black rockweed | Synonyms: Ascophyllum nodosum |
| gallbladder | (noun) a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion | Synonyms: gall bladder |
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| ladder | (noun) steps consisting of two parallel members connected by rungs; for climbing up or down | - |
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| (noun) a row of unravelled stitches | Synonyms: ravel, run |
| (noun) ascending stages by which somebody or something can progress | - |
| madder | (noun) Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin | Synonyms: Rubia tinctorum |
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| madderwort | (noun) any of numerous trees or shrubs or vines of the family Rubiaceae | Synonyms: rubiaceous plant |
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| padder | (noun) a highwayman who robs on foot | Synonyms: footpad |
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| stepladder | (noun) a folding portable ladder hinged at the top | Synonyms: step ladder |
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