The term 'POETIC POSSESSIVE' refers to a type of possessive pronoun used in poetry and literature. The two crossword solutions for this term are 'THY' (3 letters) and 'THINE' (5 letters). 'THY' is an archaic form of the possessive pronoun 'YOUR', while 'THINE' is an even more archaic form of the same pronoun. Both words are used to refer to something that belongs to someone else, usually in a poetic or literary context.