(mineralogy) A mineral with the chemical formula Ca₂(Al,Fe⁺⁺⁺)₂O₅, found in metamorphosed limestone.

Synonym of quinquennial.

(transitive) To hang or attach to, as by a string, so that the thing is suspended / (transitive) To add, as an accessory to the principal thing; to annex

(geometry) A special case of a superellipse having equal semimajor and semiminor axes.