noun
small guardrail
Rare term for a small guardrail or railing, typically found in specialized contexts such as architecture or road safety.
この橋には小欄が設置されている。
A small guardrail is installed on this bridge.
欄干 is the common word for 'railing' or 'balustrade'; 小欄 is a rare, more specific term for a small guardrail.
Compound of 小 (small) and 欄 (railing, column). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.