Other forms: handrails
A handrail is a rail to hold onto for support. Hold the handrail, a handrail on both sides, fit a handrail.
Building rules set its height and its grip, since a handrail is useless if the hand cannot close around it. On stairs it should run past the top and bottom step, which is what tells you the stairs have ended.
1nounhandrailA rail to hold onto for support.
“Hold on to the handrail when you go down the stairs.”
handrail is a rail.
Hand plus rail, from the plain description of what it is held by.
From hand + rail.
Etymology from Wiktionary, CC BY-SA