WORD ORIGIN variant of the adjective-forming suffix -al, joined to words in which an 1 l precedes the suffix: circular; lunar; singular. Origin of -ar 1
Latin -āris; replacing Middle English -er < Anglo-French, Old French < Latin -āris variant of -er, often under the influence of a spelling with 2 -ar- in a cognate Latin noun: burglar; cellar; collar; mortar; poplar; scholar; vicar; vinegar. variant of -er on the model of 1 -ar, used in the formation of nouns of agency: 2 liar; beggar.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for -ar suffix forming adjectives of; belonging to; like linear; polar; minuscular Word Origin for -ar
via Old French
-er from Latin -āris, replacing -ālis ( -al 1) after stems ending in l
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for -ar
word-formation element meaning "pertaining to, of the nature of," from Latin
-arem, -aris "of the kind of, belonging to," a secondary form of -alis, dissimilated for used after syllables with an -l- (e.g. insularis for *insulalis, stellaris for *stellalis).
Online Etymology Dictionary, © 2010 Douglas Harper