What does dragline mean?
A dragline is a strong rope, cable, or chain used for dragging or hauling heavy loads. The term is best known from surface mining, where a dragline excavator lowers its huge bucket by means of a dragging cable to strip away soil and rock. The word also has a second, quite different life in natural history: a spider's dragline is the continuous thread of silk it lays down behind itself as it moves, anchoring each step and breaking any fall. Both senses share the idea of something trailed along behind while pulling or supporting weight. Dragline is a technical term, appearing chiefly in mining, engineering, and entomological writing, but the image of a spider spinning its dragline makes it familiar from popular science. Its vividness comes from this dual character — industrial muscle on one hand, delicate natural engineering on the other — making it a precise and evocative word in both registers.
A heavy rope, cable, or chain used for dragging or hoisting loads, especially the operating cable of a dragline excavator.
"The dragline hauled the bucket across the pit floor with each swing of the boom."
Frequently encountered in the fixed phrase 'dragline excavator' in mining contexts.
The silk thread a spider trails behind it as it moves or hangs, serving as a safety line.
"A single strand of dragline silk can absorb the shock of a falling spider without breaking."
Standard regular plural; used when referring to multiple cables or the silk lines of several spiders.
"Modern draglines can move hundreds of tons of material in a day."
A spider's dragline is so strong that, pound for pound, it rivals steel — and engineers have studied it for decades trying to copy it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dragline
Dragline is an English compound formed from the verb 'drag', of Middle English origin (likely from Old Norse 'draga'), plus 'line', from Latin 'linea' meaning a linen thread or string. It arose as a technical term in nineteenth- and twentieth-century mining and excavation machinery. The compound pattern parallels similar formations such as 'towline' and 'hoistline'.
How dragline is actually used
Most common in mining, civil engineering, and arachnology contexts; in everyday speech it appears mainly in nature writing about spiders.
Easily confused with dragline
A driveline is the assembly of components transmitting power in a vehicle, whereas a dragline is a dragging cable or a spider's trailing silk thread.