As an adjective specialised
is standard spelling of from=Non-Oxford British spelling|lang=en|specialized.
As a verb specialised
is past tense of specialise.
As a noun prophyll is
the frequently specialised or reduced leaf produced at the first node of a new shoot.
prophyll
English
Noun
(
en noun)
(botany) The frequently specialised or reduced leaf produced at the first node of a new shoot.
Usage notes
Between the coining of the word and the second half of the 20th century, a great amount of confusion existed in the definitions of the word and its equivalents in French and German. Many authors believed the prophyll to be a specific structure, and specialists of the Aroidea often give it such a sense.