Celluloid is a trademark coined in 1871 from cellulose (its main ingredient, from Latin cellula, 'small cell') + the suffix -oid ('resembling', from Greek -oeides). The historical trail runs through cellula in Latin and -oeides in Ancient Greek. Morphologically, celluloid is transparent: a trademark coined in 1871 from cellulose (its main ingredient, from Latin cellula, 'small cell') + the suffix -oid ('resembling', from Greek -oeides). Used as a noun and adjective, celluloid now means "a transparent flammable plastic once used for film and photographic stock", so the present definition can be read against the older forms and meanings. The same lexical family is also visible in related forms such as cellulose and cell. The result is a borrowed or transmitted form whose modern spelling carries a compact record of its route into English.