- used to differentiate a compound from another having a similar spelling but ending in -in or -ine
- used to indicate a compound containing an internal anhydride
Origin of -einaltered from -in and -ine
A chemical compound related to a specified compound with a similar name ending in -in or -ine: phthalein.
Origin of -einAlteration of -in
- (US, taxation) Employer Identification Number