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Medical Dictionary


noun \ˈsēd\
plural seed or seeds

Medical Definition of SEED

a :  the fertilized ripened ovule of a flowering plant containing an embryo and capable normally of germination to produce a new plant; broadly :  a propagative plant structure (as a spore or small dry fruit) b :  a propagative animal structure: (1) :  milt, semen (2) :  a small egg (as of an insect) (3) :  a developmental form of a lower animal—see seed tick
:  a small usually glass and gold or platinum capsule used as a container for a radioactive substance (as radium or radon) to be applied usually interstitially in the treatment of cancer <implantation of radon seeds for bladder cancer>
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