- scale (n1.)
- "skin plates on fish or snakes," c.1300, from O.Fr. escale (12c., Mod.Fr. écale) "scale, husk," from Frank., from P.Gmc. *skælo "split, divide" (cf. O.H.G. scala "shell," Goth. skalja "tile," O.E. scealu "shell, husk), from PIE base *(s)kel- "to cut, cleave, split" (cf. L. culter "knife," scalpere "to cut, scrape;" O.C.S. skolika "mussel, shell," Rus. skala "rind, bark," O.E. scell "shell"). In reference to humans, as a condition of certain skin diseases, it is attested from c.1400. As what falls from one's eye when blindness ends (usually fig.), it echoes Acts ix.18 (L. tanquam squamæ, Gk. hosei lepides). Verb meaning "to remove the scales from (a fish)" is attested from c.1440.
- scale (n2.)
- "pan of a balance," late 14c., earlier "drinking cup" (c.1200), from O.N. skal "bowl, drinking cup," in pl., "weighing scale" from P.Gmc. *skælo "split, divide" (cf. O.N. skel "shell," O.E. scalu, O.S. skala, O.H.G. scala, Ger. Schale, M.Du. scale, Du. schaal "drinking cup, bowl, shell, scale of a balance"), see scale (n.1). The connecting sense seems to be of half of a bivalve ("split") shell used as a drinking cup or a pan for weighing. But according to Paulus Diaconus the "drinking cup" sense originated from a supposed custom of making goblets from skulls (see skull).
- scale (v.)
- "to climb," c.1380, from L. scala, from scandere "to climb" (see scan). This is also the source (perhaps via It. scala) of the noun in the musical sense (1597), and the meaning "proportion of a representation to the actual object" (1662). Scale down "reduce" is attested from 1887.