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

Definition of quinquevalent in English:

adjective

Chemistry
Another term for pentavalent.

Definition of quinquevalent in:

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Word of the day fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
adverb
(especially as a direction) very loud or loudly