English word oncofetal comes from English fetal ((embryology) Pertaining to, or connected with, a fetus.), English onco- (Pertaining to tumors.)

Detailed word origin of oncofetal

Dictionary entry	Language	Definition
fetal	English (eng)	(embryology) Pertaining to, or connected with, a fetus.
onco-	English (eng)	Pertaining to tumors.
oncofetal	English (eng)	Typically present only during fetal development, but also found in adults with certain cancers.

Words with the same origin as oncofetal