(Greek mythology, Roman mythology) Twelve tasks carried out by the Greek hero Herakles (romanized as Hercules) as his penance.

(epidemiology) The indirect protection against the spread of a contagious disease in a given population caused by the immunity of a significant proportion of the population to that particular disease; the immunity may have been obtained through having survived the infection or through vaccination.

plural of herbal supplement

A preparation that provides vitamins, minerals, amino acids, and other essential nutrients for a health goal or purported health benefit.

Used to ask whether a seat near the interlocutor is currently occupied (by someone temporarily absent).

(archaic) The deadly nightshade.

(idiomatic) present, and set to remain permanently.

A fanciful notation, commonly attributed to historical maps, held to indicate either the belief that unknown dangers exist in a certain location on the map, or that actual dragons can be found there.

An expert in or practitioner of heraldry.

(idiomatic) Listen to me!