(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.

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

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.

A model that uses simplified description of behavior of spatially distributed physical system into a topology which consists of discrete entities that approximate the behavior of the distributed system under certain assumptions.

Alternative form of rare earth element