noun
screw; screw spike
Refers to a threaded fastener, often a wood screw or a screw spike used in construction or railways.
この棚はねじ釘で固定されている。
This shelf is fixed with screws.
線路の枕木にねじ釘を打ち込む。
Drive screw spikes into the railway sleepers.
Rarely used kanji form; 螺子 is an uncommon spelling for ねじ.
Compound of ねじ (screw) and 釘 (nail). The exact historical derivation is uncertain, but the word transparently describes a nail-like screw.