strontium-90
(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
(medicine) A contraindication.
(zoology) having both mandibles of equal length, with the tips meeting, as in certain birds
(anatomy) The anterior part of the medulla oblongata.
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