The term 'PREFIX WITH FORM' refers to four words that all have a prefix followed by the word 'FORM'. The first word is 'AERI', which is a prefix meaning 'AIR' and the full word is 'aeriform', meaning 'having the FORM of AIR'. The second word is 'UNI', which is a prefix meaning 'ONE' and the full word is 'UNIFORM', meaning 'having the same FORM or appearance'. The third word is 'OVI', which is a prefix meaning 'EGG' and the full word is 'OVIFORM', meaning 'having the FORM of an EGG'. The last word is 'TRANS', which is a prefix meaning 'ACROSS' and the full word is 'TRANSFORM', meaning 'to change in FORM, appearance, or structure'.