Etymology
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Words related to granular

*gre-no- 
*grə-no-, Proto-Indo-European root meaning "grain."

It forms all or part of: corn (n.1); filigree; garner; garnet; grain; granary; grange; granger; granite; granular; granule; grenade; grenadine; kernel; pomegranate.

It is the hypothetical source of/evidence for its existence is provided by: Latin granum "seed," Old Church Slavonic zruno "grain," Lithuanian žirnis "pea," Old English corn.
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-ar 

word-formation element meaning "pertaining to, of the nature of," from Latin -arem, -aris "of the kind of, belonging to," a secondary form (by dissimilation) of -alis, used after syllables with an -l- (such as insularis for *insulalis, stellaris for *stellalis).

granola (n.)
by 1967, American English, probably from Italian grano "grain," or granular, with commercial suffix -ola. Earlier, with a capital G-, it was a proprietary name (reg. 1886 by W.K. Kellogg, in use into early 20c.) for a kind of breakfast cereal.
granulation (n.)
Origin and meaning of granulation

"act of forming into grains," 1610s, from Late Latin granulum "granule" (see granular) + -ation.

granuloma (n.)
"granulated tissue produced by certain diseases," from Latin granulum "granule" (see granular) + -oma, on model of glaucoma, etc.