a fairy or a fairy hill. The belief in these supernatural beings is still general among the Celtic races. It was believed that they resided in the interior of pleasant hills called _sidhe_ or _siodha_. The word frequently takes the form of _shee_, as in the Shee Hills, in Co. Meath; Glenshee, in Perthshire; Mullaghshee (the fairy hillock); Sheetrim, _i.e._ _Sidh-dhruim_ (the fairy ridge), the old name of the rock of Cashel; Killashee (the church near the fairy hill); Rashee (the fort of the fairies); also Shean, Sheann, Sheane, Shane, in Ireland. [Sidenote: SIERRA (Span.), CERRO (Port.),] a mountain chain, having a serrated appearance, from the Lat. _serra_, a saw; or perhaps from the Ar. _sehrah_, an uncultivated tract of land, being the root of the desert of Sahara, in Africa; _e.g._ Sierra-de-fuentes (the mountain chain of the fountains); Sierra-de-los-vertientes (of the cascades); Sierra Leone (of the lion); Sierra-Calderona (the mountain chain with the cauldrons or craters); Sierra-de-las-Monas (of the apes); Sierra Morena (the dark mountain range); Sierra Nevada (the snowy); Sierra Estrella (the starry mountain range); Sierra-de-Culebra (of the snake); Sierra-de-gata (of agates); Esmeraldas-Serradas (the emerald mountains), in Brazil; Cerro-da-vigia (the mountain of observation); Cerro-de-la-Giganta (of the giantess); Cerro-largo (broad mountain); Cerro-gordo (fruitful mountain); Cerro-del-cobre (of the snake); but _serra_, in Italian, means a narrow place--as in Serra-capriola (the narrow place of the goats); and Serra-Monascesca (of the monks). [Sidenote: SKAER (Scand.), SGOR and SGEIR (Gadhelic),] a sharp rock-allied to the Welsh _skerid_, cleft asunder, _ysgariad_; _e.g._ Skerid-fawn and Skerid-fach (the great and little skerid or division). _Esgair_ is another word from the same root, applied to a long ridge; _e.g._ Esgair-hir (the long ridge); Esgair-graig (the rock ridge)--_e.g._ Scarcliff (the cliff of the sharp rock); Nashscaur (the promontory of the steep rock); Scarborough (the town on the rock or cliff); Scorton, with the same meaning, in Yorkshire; Scarnose and Scarness (the sharp cape); Skerryford, Skeerpoint, on the coast of Wales; Sheerness (the sharp headland), on the Thames; Scaranos, with the same meaning, on the coast of Sicily; Scarabines (the sharp points), in Caithness; Scuir (a sharp rock), on the island of Egg; Scordale, in Westmoreland, and Scordal, in Iceland (the valley of the steep rock); Scarsach (abounding in steep rocks), in Perth; Scarba (the island of the sharp rock), and Scarp, in the Hebrides; the Skerry and the Skerries, in the Shetlands, and on the coast of Ireland and Wales; Skerry-vore (the great rock), in the Hebrides. [Sidenote: SKAW, SKAGI (Scand.),] an isthmus or promontory; _e.g._ the Skaw or Skagen Cape, on the coast of Denmark; Skagerack or Skagen-rack (the strait near the promontory). [Sidenote: SKI, SK, SKIA,]