An etheree is a poem of ten lines in which each line contains one more syllable than the last. Beginning with one syllable and ending with ten, this unrhymed form is named for its creator, 20th century American poet Etheree Taylor Armstrong.
Variant forms of the etheree include the reverse form, which begins with 10 syllables and ends with one. The double etheree is twenty lines, moving from one syllable to 10, and then from 10 back to one. (I suppose a double etheree could also move from 10 syllables to one, and then from one back to 10.)
You can learn more about the etheree at The Poets Garret and Shadow Poetry.
I hope you'll join me this week in writing an etheree. Please share a link to your poem or the poem itself in the comments.