What is a poem written in tercets with but two rhymes, the first and third verse of the first stanza alternating as the third verse in each successive stanza and forming a couplet at the close. E. W. Gosse called?

villanelle — A poem written in tercets with but two rhymes, the first and third verse of the first stanza alternating as the third verse in each successive stanza and forming a couplet at the close. E. W. Gosse. (Webster's 1913.)