…a part or aspect of something abstract, especially one that is essential or characteristic…
…an element consisting of nuclear fuel and other materials for use in a reactor…
…an elongated cell in the phloem of a vascular plant, in which the primary wall is perforated by pores through which water is conducted…
…a chemical element present only in minute amounts in a particular sample or environment…
…be in (or not in) a situation or environment that one particularly likes and in which one can perform well…
…a sieve element of a type present in angiosperms, a series of which are joined end to end to form sieve tubes, with sieve plates between the elements…
…the DNA of a cytoplasmic organelle, such as a mitochondrion or chloroplast, responsible for cytoplasmic inheritance…
…each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms…
…an element of a set that, if combined with another element by a specified binary operation, leaves that element unchanged…
…any of the set of metallic elements occupying a central block (Groups IVB-VIII, IB, and IIB, or 4-12) in the periodic table, e.g., iron, manganese, chromium, and copper. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored…
…any of a group of chemically similar metallic elements comprising the lanthanide series and (usually) scandium and yttrium. They are not especially rare, but they tend to occur together in nature and are difficult to separate from one another…
