Alternative form of arse is gone right out of 'er

A weasel found in northern latitudes (Mustela erminea in Eurasia, Alaska, and the Arctic, Mustela haidarum in Haida Gwaii, Mustela richardsonii in the rest of North America); its dark brown fur turns white in winter, apart from the black tip of the tail.

(heraldry): In blazon, of the colour hermine (white with black spots).

To clothe with ermine.

A time period of indeterminate length, generally more than one year. / (geology) A geochronologic unit of tens to hundreds of millions of years; a subdivision of an eon, and subdivided into periods.

plural of erratum

An added page in a printed work where errors which are discovered after printing and their corrections (corrigenda) are listed.

A chemical element (symbol Er) with atomic number 68: a silvery-white metal, in nature always found in combination with other elements. / (countable) A single atom of this element.

(uncountable) The state, quality, or condition of being wrong. / (countable) A mistake; an accidental wrong action or a false statement not made deliberately.

(computing) To function improperly due to an error, especially accompanied by error message. / (telecommunications) To show or contain an error or fault. / (nonstandard) To err.