-ein Definition
ēn, ēin
suffix
A chemical compound related to a specified compound with a similar name ending in –in or –ine:
Phthalein.
American Heritage
affix
Used to differentiate a compound from another having a similar spelling but ending in -in or -ine.
Webster's New World
Used to indicate a compound containing an internal anhydride.
Webster's New World
abbreviation
(US, taxation) Employer Identification Number.
Wiktionary
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