strontium-90
(medicine) A contraindication.
(anatomy) The anterior part of the medulla oblongata.
(physics) The radioactive isotope of strontium, ⁹⁰₃₈Sr, that is present in the fallout from nuclear explosions and, being chemically similar to calcium, is accumulated in the bones
(zoology) having both mandibles of equal length, with the tips meeting, as in certain birds
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