| angiosperm | (noun) plants having seeds in a closed ovary | Synonyms: flowering plant |
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| endosperm | (noun) nutritive tissue surrounding the embryo within seeds of flowering plants | - |
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| episperm | (noun) protective outer layer of seeds of flowering plants | Synonyms: seed coat, testa |
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| gymnosperm | (noun) plants of the class Gymnospermae having seeds not enclosed in an ovary | - |
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| perisperm | (noun) the nutritive tissue outside the sac containing the embryo in some seeds | - |
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| perm | (noun) a series of waves in the hair made by applying heat and chemicals | Synonyms: permanent, permanent wave |
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| (verb) give a permanent wave to | - |
| progymnosperm | (noun) an ancestral fossil type from which modern gymnosperms are thought to have derived | - |
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| pteridosperm | (noun) an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) | Synonyms: seed fern |
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| sperm | (noun) the male reproductive cell; the male gamete | Synonyms: sperm cell, spermatozoan, spermatozoon |
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