Google SOAP API and to get definitions of entered query

Can any one help me with goggle SOAP API.I am new to web applications.
my task is to fetch query result from goggle but query should be phrases for which use wants to know definitions.


goggle provides functionality of define:HP
this will return all definitions of HP. define is function which we are passing alone with query.

My problem with Search API is it's works perfectly well with normal query but when i am entering define:HP and trying fetch document it returns nothing as
define:HP goes as a string instead of define as function and HP as query.

IS someone can help me to solve this problem or is there any other way of getting document from web.
please, help me.. i am looking out for this solution from long time/