clavis

1. A Roman key.
2. A device for restraint of the hands.
3. Synonym of glossary: a key to the meaning of various terms.
4. A key; an identification guide; a series of logically organized groups of discriminating information which aims to allow the user to correctly identify a taxon.

Pronounced as (IPA)

/ˈkleɪ.vɪs/

Etymology

From Latin clāvis (“a key”). Doublet of clave and clef.