Is it farther or further?
c.1300, from Old French entrailles (12c.), from Late Latin intralia "inward parts, intestines" (8c.), from Latin interanea, neuter plural of interaneus "internal, that which is within," from inter "between, among" (see inter-).
entrails en·trails (ěn'trālz', -trəlz)
The internal organs, especially the intestines; viscera.