Etymology: < -ean (in e.g. European adj.: see note).-ean as an ending of words formed with -an suffix. Many English words end in -ean as a result of suffixation with -an suffix of Latin adjectives (frequently derived from proper names) ending in -aeus , -eus (or ancient Greek adjectives ending in -ειος , -αιος ). The earliest examples date from late Middle English and early modern English, e.g. epicurean n., empyrean adj., Pythagorean n. Some of these now end in -aean in their standard form, reflecting Latin -aeus (e.g. Cananaean n. and Hebraean n.). Such formations continue to the present, and include a number of scientific terms based on taxonomic names (e.g. crustacean n.). Formations with -an suffix suffixed to names ending in (non-silent) -e (in languages other than Latin or Greek) are also sometimes found, from the early 18th cent. onwards, e.g. Chilean adj., Vendean n. The distinct suffix -ean. On the pattern of words of this type, -ean suffix gradually emerges as a productive suffix forming adjectives based on names ultimately of Greek and Latin origin ending in vowels other than -e ; such formations are first attested in the mid 16th cent. (e.g. Etnean adj.). It is also used to form derivatives of names of non-classical origin, usually ending in (silent) -e (e.g. Boylean adj., Mysorean n.), but not invariably (compare Niagarean adj. and perhaps Caribbean adj.). Formations not derived from names appear from the 17th cent. (e.g. celeripedean n. and adj., polymorphean adj.) and become slightly more common in the 19th cent. -ean as a variant of -ian. Up to the early modern period, -ean suffix is also often used as a variant of the more common -ian suffix (compare e.g. the α. forms at epicurean n. and adj., Micenyen at Mycenaean n. and adj. Forms, and the β. forms at labyrinthian adj.); in later use, the two suffixes have become more distinct, although they are still used in very similar ways and often formations in both are found on the same base.
This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2020).