| acropetal | (adjective) of leaves or flowers; developing or opening in succession from base to apex | - |
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| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| basipetal | (adjective) of leaves or flowers; developing or opening in succession from apex to base | - |
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| centripetal | (adjective) tending to move toward a center | - |
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| (adjective) of a nerve fiber or impulse originating outside and passing toward the central nervous system | Synonyms: receptive, sensory |
| (adjective) tending to unify | Synonyms: unifying |
| corticipetal | (adjective) of a nerve fiber or impulse originating outside and passing toward the cerebral cortex | Synonyms: corticoafferent |
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| gamopetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: sympetalous |
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| petabit | (noun) a unit of information equal to 1000 terabits or 10^15 bits | Synonyms: Pb, Pbit |
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| petabyte | (noun) a unit of information equal to 1024 tebibytes or 2^50 bytes | Synonyms: PB, pebibyte, PiB |
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| (noun) a unit of information equal to 1000 terabytes or 10^15 bytes | Synonyms: PB |
| petaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one quadrillion floating-point operations a second. | Synonyms: PFLOPS |
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| petal | (noun) part of the perianth that is usually brightly colored | Synonyms: flower petal |
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| petaled | (adjective) (of flowers) having petals | Synonyms: petalled, petalous |
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| petalled | (adjective) (of flowers) having petals | Synonyms: petaled, petalous |
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| petalless | (adjective) (of flowers) having no petals | Synonyms: apetalous |
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| petallike | (adjective) resembling a petal | Synonyms: petal-like |
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| petaloid | (adjective) resembling a flower petal | - |
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| petalous | (adjective) (of flowers) having petals | Synonyms: petaled, petalled |
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| petard | (noun) an explosive device used to break down a gate or wall | - |
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| polypetalous | (adjective) having a corolla composed of many separated or distinct petals | - |
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| schizopetalon | (noun) a dainty South American annual having deeply pinnatifid leaves and racemes of fringed almond-scented purple-white flowers | Synonyms: Schizopetalon walkeri |
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| sympetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: gamopetalous |
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