(HTML) An HTML element that normally begins on a new line, and may or may not contain other block level elements or inline elements.

(chemistry) Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium.

(chemistry) A systematic name for an element, derived from the digits of its atomic number to which the suffix -(i)um is appended; normally only used for transuranic elements before or for a short period after they have been created, after which they will be given a non-systematic name.

Any part of a mechanism that exercises some form of logical control, such as a ratchet, trip, detent or interlock.

(inorganic chemistry, physics) Any chemical element from the main group.

(botany) A type of sclerenchyma cell located in the phloem that is involved in the movement of carbohydrates.

(idiomatic) In a situation which is unsuitable, unfamiliar, or unenjoyable.

Viral DNA embedded within the genome of a non-virus organism which is left over from an ancestral infection which integrated viral DNA into the genomic heritage of the organism's ancestry.

plural of systematic element name.

Alternative form of rare earth element