cockatricecockatrice

Cockatrice comes from Old French cocatriz ‘basilisk, cockatrice’, from Late Latin calcātrīx ‘female trampler, treader’, and ultimately from Latin calx ‘heel’.

1. Latinc. 75 BCE–200 CEcalx¹‘heel’
2. Latinc. 75 BCE–200 CEcalcāre¹‘to trample, to walk upon, to oppress’
3. Late Latinc. 200–600 CEcalcātrīx¹‘female trampler, treader’
4. Old Frenchc. 842–1400cocatriz¹‘basilisk, cockatrice’
5. Middle Englishc. 1150–1500cocatrice¹‘basilisk’
6. Englishearliest quotation a. 1382cockatrice¹

1. ¹ Wiktionary, English cockatrice
2. Earliest quotation in Wiktionary’s entry: a. 1382, Wycliffe's Bible: “Vp on the eddere and the kokatrice thou shalt…”.

Earlier history uncertain. See Wiktionary.