(organic chemistry) A tetrahydroxypyrrolizidine alkaloid related to alexine and australine.

(transitive) To edge, cover, or point with steel. / (transitive) To harden or strengthen; to nerve or make obdurate; to fortify against. / (transitive, obsolete, of mirrors) To back with steel.

(obsolete) Deserving of being hanged.

Partial achromatopsia, typically in only one eye