The insertion of excrescent p occurs after m in other words in Chaucer; as in solempne, dampne.
An excrescent b, as in chimbley and fambly, seems to be native.
Round and about the tent and on its excrescent flooring were heaped our boxes, otherwise the wind would have blown it over.
You are regarded an excrescent growth on the body of civil society.
Skeat explains this form as fallen with an excrescent d, due to Scandinavian influence, citing also Bk.
If heavy rains happen at this critical period, they will wash this excrescent substance off, and thereby damage the plants.
excrescent ex·cres·cent (ĭk-skrěs'ənt)
Growing out abnormally, excessively, or superfluously.