| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| anthophyllite | (noun) a dark brown mineral of the amphibole group; magnesium iron silicate | - |
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| argyll | (noun) a sock knitted or woven with an argyle design | Synonyms: argyle |
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| (noun) a design consisting of a pattern of varicolored diamonds on a solid background (originally for knitted articles); patterned after the tartan of a clan in western Scotland | Synonyms: argyle |
| (noun) a covered gravy holder of silver or other metal containing a detachable central vessel for hot water to keep the gravy warm | Synonyms: argyle |
| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| beryllium | (noun) a light strong brittle grey toxic bivalent metallic element | Synonyms: atomic number 4, Be, glucinium |
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| cataphyll | (noun) a reduced or scarcely developed leaf at the start of a plant's life (i.e., cotyledons) or in the early stages of leaf development | - |
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| chlorophyll | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyl |
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| cladophyll | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, phylloclad, phylloclade |
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| decasyllable | (noun) a verse line having ten syllables | - |
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| dissyllable | (noun) a word having two syllables | Synonyms: disyllable |
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| disyllable | (noun) a word having two syllables | Synonyms: dissyllable |
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| epiphyllum | (noun) any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers | Synonyms: orchid cactus |
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| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
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| idyll | (noun) a short poem descriptive of rural or pastoral life | Synonyms: bucolic, eclogue, idyl |
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| (noun) a musical composition that evokes rural life | Synonyms: idyl, pastoral, pastorale |
| (noun) an episode of such pastoral or romantic charm as to qualify as the subject of a poetic idyll | - |
| isosyllabism | (noun) (linguistics, poetry) the use of isosyllabic verse. | - |
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| megasporophyll | (noun) in non-flowering plants, a sporophyll that bears only megasporangia | - |
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| microsporophyll | (noun) in non-flowering plants, a sporophyll that bears only microsporangia | - |
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| monosyllable | (noun) a word or utterance of one syllable | Synonyms: monosyllabic word |
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| octosyllable | (noun) a verse line having eight syllables or a poem of octosyllabic lines | - |
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| pentoxifylline | (noun) a drug (trade name Trental) used to treat claudication; believed to increase the flexibility of red blood cells so they can flow through the blood vessels to the legs and feet | Synonyms: Trental |
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| phyllo | (noun) tissue thin sheets of pastry used especially in Greek dishes | - |
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| phylloclad | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, cladophyll, phylloclade |
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| phylloclade | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, cladophyll, phylloclad |
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| phyllode | (noun) an expanded petiole taking on the function of a leaf blade | - |
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| phylloquinone | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phytonadione, vitamin K1 |
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| polysyllable | (noun) a word of more than three syllables | Synonyms: polysyllabic word |
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| prophyll | (noun) a plant structure resembling a leaf | - |
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| psylla | (noun) small active cicada-like insect with hind legs adapted for leaping; feeds on plant juices | Synonyms: jumping plant louse, psyllid |
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| psyllid | (noun) small active cicada-like insect with hind legs adapted for leaping; feeds on plant juices | Synonyms: jumping plant louse, psylla |
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| psyllium | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: fleawort, Plantago psyllium, Spanish psyllium |
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| pyrophyllite | (noun) a white or greenish aluminum silicate mineral (resembles talc) | - |
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| spathiphyllum | (noun) any of various plants of the genus Spathiphyllum having a white or green spathe and a spike of fragrant flowers and often cultivated as an ornamental | Synonyms: peace lily, spathe flower |
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| sporophyll | (noun) leaf in ferns and mosses that bears the sporangia | Synonyms: sporophyl |
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| syllabary | (noun) a writing system whose characters represent syllables | Synonyms: syllabic script |
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| syllabication | (noun) forming or dividing words into syllables | Synonyms: syllabification |
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| syllabicity | (noun) the pattern of syllable formation in a particular language | - |
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| syllabification | (noun) forming or dividing words into syllables | Synonyms: syllabication |
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| syllable | (noun) a unit of spoken language larger than a phoneme | - |
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| syllabub | (noun) sweetened cream beaten with wine or liquor | Synonyms: sillabub |
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| (noun) spiced hot milk with rum or wine | Synonyms: sillabub |
| syllabus | (noun) an integrated course of academic studies | Synonyms: course of study, curriculum, program, programme |
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| syllepsis | (noun) use of a word to govern two or more words though agreeing in number or case etc. with only one | - |
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| syllogiser | (noun) logician skilled in syllogistic reasoning | Synonyms: syllogist, syllogizer |
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| syllogism | (noun) deductive reasoning in which a conclusion is derived from two premises | - |
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| syllogist | (noun) logician skilled in syllogistic reasoning | Synonyms: syllogiser, syllogizer |
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| syllogistic | (noun) in logic, the formal analysis of logical terms and operators and the structures that make it possible to infer true conclusions from given premises. | - |
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| syllogizer | (noun) logician skilled in syllogistic reasoning | Synonyms: syllogiser, syllogist |
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| theophylline | (noun) a colorless crystalline alkaloid derived from tea leaves or made synthetically; used in medicine as a bronchial dilator | Synonyms: Elixophyllin, Slo-Bid, Theobid |
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| trisyllable | (noun) a word having three syllables | - |
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| xanthophyll | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyl |
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