Online Etymology Dictionary

schism: late 14c., scisme, "dissention within the church," from O.Fr. cisme "a cleft, split," from L.L. schisma, from Gk. skhisma (gen. skhismatos) "division, cleft," from stem of skhizein "to split" (see shed (v.)). Spelling restored 16c., but pronunciation unchanged. Often in reference to the Great Schism (1378-1417) in the Western Church. Related: Schismatic (n.; late 14c.).
Raskolnik: "dissenter from the Russian Church, an Old Believer," 1723, from Rus. Raskolnik "separatise," from raskol "schism, separation." The schism was a result of reforms by Patriarch Nikon in 1667.
Donatist: c.1460, adherent of a Christian sect in 4c. North Africa, from M.L. Donatista, from Donatus name of one of the principal men in it. The schism had more to do with episcopal succession in Carthage than with doctrine.
Nicene: 1432, in ref. to Nicaea (Gk. Nikaia, modern Turk. Isnik), city in Bithynia where ecclesiastical council of 325 C.E. dealt with the Arian schism and produced the Nicene Creed. A second council held there (787) considered the question of images.
sch-: this letter group can represent five distinct sounds in English; it first was used by M.E. writers to render O.E. sc-, a sound now generally pronounced "-sh-." Sometimes it was miswritten for -ch-. It also was taken in from Ger. (schnapps) and Yiddish (schlemiel). In words derived from classical languages, it represents L. sch-, Gk. skh- but in some of these words the spelling is a restoration and the pronunciation does not follow it (cf. schism).
-sch-: this letter group can represent five distinct sounds in English; it first was used by M.E. writers to render O.E. sc-, a sound now generally pronounced "-sh-." Sometimes it was miswritten for -ch-. It also was taken in from Ger. (schnapps) and Yiddish (schlemiel). In words derived from classical languages, it represents L. sch-, Gk. skh- but in some of these words the spelling is a restoration and the pronunciation does not follow it (cf. schism).
poplin: 1710, from Fr. papeline "cloth of fine silk and worsted" (1667), probably from Prov. papalino, fem. of papalin "of or belonging to the pope," from M.L. papalis "papal." The reference is to Avignon, papal residence during the schism 1309-1408 (and regarded as a papal town until 1791), which also was a center of silk manufacture. Influenced in Eng. by Poperinghe, town in Flanders where the fabric was made (but from 18c. the primary source was Ireland).
schedule: 1397, sedule, cedule "ticket, label, slip of paper with writing on it," from O.Fr. cedule, from L.L. schedula "strip of paper," dim. of L. schida "one of the strips forming a papyrus sheet," from Gk. skhida "splinter," From stem of skhizein "to cleave, split" (see shed (v.) and cf. schism). The notion is of slips of paper attached to a document as an appendix (a sense maintained in U.S. tax forms). The specific meaning "printed timetable" is first recorded 1863 in railway use (the verb in this sense is from 1862). Modern spelling is 15c., in imitation of L.; the modern British pronunciation ("shed-yul") is from Fr. influence, while the U.S. pronunciation ("sked-yul") is from the practice of Webster, and is based on the Greek original.