| phloem | (noun) (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes | Synonyms: bast |
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| phlogiston | (noun) a hypothetical substance once believed to be present in all combustible materials and to be released during burning | - |
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| phlogopite | (noun) a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum | - |
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| phlomis | (noun) any of various plants of the genus Phlomis; grown primarily for their dense whorls of lipped flowers and attractive foliage | - |
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| phlox | (noun) any polemoniaceous plant of the genus Phlox; chiefly North American; cultivated for their clusters of flowers | - |
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