One of the mysteries of the English language finally explained.
In plural Frogspawn.
1Rods (especially metal rods) collectively; an arrangement of rods.
2The action or process of pushing a rod or rods through a duct, drain, or pipe, especially in order to clear it.
3Geology. A linear structure in metamorphic rocks characterized by the arrangement of grains of a constituent mineral, especially quartz, in parallel rods.
Late 15th century (in an earlier sense). From rud + -ing<br>early 17th century (in an earlier sense). Partly from rod + -ing, and partly from rod + -ing.
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