[1920–25; bi-1 + -chrome]This word is first recorded in the period 1920–25. Other words that entered Englishat around the same time include: checkout, follow-up, fundamentalism, slalom, tie-inbi- is a combining form meaning “twice,” “two,” used in the formation of compound words.Other words that use the affix bi- include: bilabial, bilateral, bimodal, bisect, bivalve