Definition of quinquevalent in English:

quinquevalent

Syllabification: quin·que·va·lent
Pronunciation: /ˌkwiNGkwəˈvālənt
 
/

adjective

Chemistry
Another term for pentavalent.

Definition of quinquevalent in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal