| phycobilin | (noun) water-soluble proteinaceous pigments found in red algae and cyanobacteria | - |
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| phycocyanin | (noun) blue pigment in algae | - |
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| phycoerythrin | (noun) red pigment in red algae | - |
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| phycology | (noun) the branch of botany that studies algae | Synonyms: algology |
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| phycomycosis | (noun) any fungal infection caused by fungi of the Phycomycetes group | - |
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| phylactery | (noun) (Judaism) either of two small leather cases containing texts from the Hebrew Scriptures (known collectively as tefillin); traditionally worn (on the forehead and the left arm) by Jewish men during morning prayer | Synonyms: tefillin |
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| phyle | (noun) a tribe of ancient Athenians | - |
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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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| phylogenesis | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogeny |
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| phylogeny | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogenesis |
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| phylum | (noun) (biology) the major taxonomic group of animals and plants; contains classes | - |
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| (noun) (linguistics) a large group of languages that are historically related | - |
| physa | (noun) any member of the genus Physa | - |
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| physiatrics | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physical therapy, physiotherapy |
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| physic | (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: aperient, cathartic, purgative |
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| physicalism | (noun) (philosophy) the philosophical theory that matter is the only reality | Synonyms: materialism |
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| physicality | (noun) preoccupation with satisfaction of physical drives and appetites | Synonyms: animalism |
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| physicalness | (noun) the quality of being physical; consisting of matter | Synonyms: corporality, corporeality, materiality |
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| physician | (noun) a licensed medical practitioner | Synonyms: doc, doctor, Dr., MD, medico |
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| physicist | (noun) a scientist trained in physics | - |
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| physics | (noun) the science of matter and energy and their interactions | Synonyms: natural philosophy |
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| (noun) the physical properties, phenomena, and laws of something | Synonyms: physical science |
| physiognomy | (noun) the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British) | Synonyms: countenance, kisser, mug, phiz, smiler, visage |
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| physiography | (noun) the study of physical features of the earth's surface | Synonyms: physical geography |
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| physiologist | (noun) a biologist specializing in physiology | - |
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| physiology | (noun) processes and functions of an organism | - |
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| (noun) the branch of the biological sciences dealing with the functioning of organisms | - |
| physiotherapist | (noun) therapist who treats injury or dysfunction with exercises and other physical treatments of the disorder | Synonyms: physical therapist |
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| physiotherapy | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physiatrics, physical therapy |
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| physique | (noun) constitution of the human body | Synonyms: body-build, build, habitus |
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| (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, build, chassis, figure, flesh, form, frame, human body, material body, physical body, shape, soma |
| physostegia | (noun) any of various plants of the genus Physostegia having sessile linear to oblong leaves and showy white or rose or lavender flowers | - |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| phytelephas | (noun) small genus of South American feather palms | Synonyms: genus Phytelephas |
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| phytochemical | (noun) a chemical substance obtained from plants that is biologically active but not nutritive | - |
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| phytochemist | (noun) a chemist who specializes in the chemistry of plants | - |
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| phytochemistry | (noun) the branch of organic chemistry dealing with the chemistry of plants | - |
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| phytohormone | (noun) (botany) a plant product that acts like a hormone | Synonyms: growth regulator, plant hormone |
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| phytologist | (noun) a biologist specializing in the study of plants | Synonyms: botanist, plant scientist |
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| phytology | (noun) the branch of biology that studies plants | Synonyms: botany |
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| phytonadione | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phylloquinone, vitamin K1 |
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| phytoplankton | (noun) photosynthetic or plant constituent of plankton; mainly unicellular algae | - |
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| phytotherapy | (noun) the use of plants or plant extracts for medicinal purposes (especially plants that are not part of the normal diet) | Synonyms: botanical medicine, herbal therapy |
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| phytotoxin | (noun) any substance produced by plants that is similar in its properties to extracellular bacterial toxin | Synonyms: plant toxin |
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