Fixture, (light-)fitting, framework, mounting accessory/ies. Construction-material street-name group, and close to two of the town’s main building supplies’ merchants. See also Asfaldi.
Dry upland meadow or grassland. Also means reason, mind, intellect, understanding or wits (Ma saan aru means “I understand”, a statement often followed by devastating proof that, in fact, they don’t). Part of a fodder and staples street-name group. See Auna.
Silver or lowland birches (Sing.: arukask), Betula pendula, aka kask, arukõiv (kõiv is a dialectal, and probably older, name for birch), õmmik (the beneedled), etc. Since Aru or arro also means dry land, this may well reflect the tree’s habitat.