English
integrand
From integral + -and.
A compound of integral + -and
Proto-Indo-European *n̥-th₂g-ró-s
Proto-Italic *n̥tagros ‘untouched’
Latin integer ‘entire’
Medieval Latin integrālis
Middle French integral ‘integral, necessary to the function of the whole’
English integral
Today it means
noun The function that is to be integrated
Language periods are conventional ranges, not dates for this word.
Etymograph / integrand