| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | direktrico | direktricoj |
| Accusative | direktricon | direktricojn |
| Catalan | directriu |
|---|---|
| Dutch | directrix; richtlijn |
| English | directrix |
| German | Direktrix; Leitlinie |
| Portuguese | directriz |
| Spanish | directriz |