This Dictionary is an attempt to give access to the whole paraphernalia of chemical terms in a crisp package.The terms have been explained in simple and comprehensible manner,with relevant pictures and illustrations to bring Clarity.The Dictionary can be taken as a complete and cognisable set of chemical terms to be used as a referral.Since Chemistry is a vast subject,a complete inventory of nonetheless,an attempt has been made towards providing a gamut of terms,which form a part and parcel of the subject.This book is a complete book of 'A to Z ' Chemistry difficult Terms.