Verbs in the ceñir model conjugate like pedir: the stem-vowel e changes to i in both Boot and Gerund-stem positions. But the RAE puts them in a separate model because the ñ triggers the ñi → ñ spelling rule, which involves a subtle pronunciation change.

1 verb out of the top 350 Spanish verbs conjugates like ceñir:

InfinitiveBootGerund
teñirtiñestiñiendo

4 uncommon Spanish verbs conjugate like ceñir:

These conjugation tables are generated with seven-stems-conjugator, the open-source Python conjugation engine behind Seven Stems.