| 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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