Etymology
Advertisement
mold (n.1)

also mould, "hollow pattern of a particular form by which something is shaped or made," c. 1200, originally in a figurative sense, "fashion, form; nature, native constitution, character," metathesized from Old French modle "model, plan, copy; way, manner" (12c., Modern French moule), from Latin modulum (nominative modulus) "measure, model," diminutive of modus "manner" (from PIE root *med- "take appropriate measures").

By c. 1300 as "form into which molten metal, etc., is run to obtain a cast." By 1570s as "a form of metal or earthenware (later plastic) to give shape to jellies or other food. Figurative use of break the mold "render impossible the creation of another" is from 1560s.

Related entries & more 
Advertisement
mold (n.2)

also mould, "minute, furry fungus," especially the types growing on neglected food and decaying organic matter, c. 1400, molde, probably from moulde, past participle of moulen "to grow moldy" (early 13c.), related to Old Norse mygla "grow moldy," possibly from Proto-Germanic *(s)muk- indicating "wetness, slipperiness," from PIE *meug- (see mucus). Or it might have evolved from (or been influenced by) Old English molde "loose earth" (see mold (n.3)).

Related entries & more 
mold (n.3)

"fine, soft, loose earth," Old English molde "earth, sand, dust, soil; land, country, world," from Proto-Germanic *mulda (source also of Old Frisian molde "earth, soil," Old Norse mold "earth," Middle Dutch moude, Dutch moude, Old High German molta "dust, earth," Gothic mulda "dust"), from PIE root *mele- "to crush, grind." Specifically, since late (Christian) Old English, "the earth of the grave." Also, from c. 1300 as "earth as the substance out of which God made man; the 'dust' to which human flesh returns."

The proper spelling is mold, like gold (which is exactly parallel phonetically); but mould has long been in use, and is still commonly preferred in Great Britain. [Century Dictionary, 1897]
Related entries & more 
mold (v.)

also mould, mid-14c., "to mix, blend (something) by kneading;" late 14c. "to knead (bread), form into a particular shape," from mold (n.1). Figurative sense (of character, etc.) is from c. 1600. Related: Molded; molding.

Related entries & more 
molded (adj.)

also moulded, "formed in or as in a mold," 1680s, past-participle adjective from mold (v.).

Related entries & more 
Advertisement
moldable (adj.)

also mouldable, "capable of being molded," 1620s, from mold (v.) + -able. Related: Moldably; moldability.

Related entries & more 
mould 

chiefly British English spelling of mold (q.v.) in various senses. Related: Moulded; moulding.

Related entries & more 
molder (n.)

also moulder, mid-15c. (late 13c. as a surname), "one who molds or forms into shape," agent noun from mold (v.).

Related entries & more 
moldy (adj.)

also mouldy, "overgrown or covered with mold, decaying," 1570s, earlier mowly (late 14c.), from mold (n.2) + -y (2). Related: Moldiness.

Related entries & more 
molder (v.)

also moulder, "to crumble away, turn to mold or dust by natural decay," 1530s, probably frequentative based on mold (n.3) "loose earth." Related: Moldered; moldering.

Related entries & more