Pentateuchn.

Pentateuchfirst five books of the Bible, c. 1400, from Late Latin pentateuchus (Tertullian, c.207), from Greek pentateukhos (c. 160), originally an adjective (abstracted from phrase pentateukhos biblos), from pente "five" (see five) + teukhos "implement, vessel, gear" (in Late Greek "book," via notion of "case for scrolls"), literally "anything produced," related to teukhein "to make ready," from PIE *dheugh- "to produce something of utility" (see doughty). Glossed in Old English as fifbec.