IPA: /ˌɑːrˈtɪr.i.oʊ.lər/
KK: /ɑrˈtɪr.i.oʊ.lər/
Relating to a small blood vessel that branches from an artery and leads to capillaries.
The arteriolar walls are thinner than those of larger arteries, allowing for better exchange of nutrients and waste.
Arteriolar is formed from "arteria" (from Latin, meaning artery) and "-olar" (a diminutive suffix indicating smallness). The word "arteriolar" refers to something that is related to or resembling small arteries.
Think of 'arteria' meaning artery, and the '-olar' suffix indicating something small — so arteriolar refers to small arteries.