What is it called to spell a word using sentences?

There isn't a specific, widely recognized term for spelling a word using sentences. However, here are some options you could use:

* Sentence Spelling: This is a straightforward and descriptive term.

* Sentential Anagram: This emphasizes the anagrammatic nature of the exercise, as you're essentially rearranging letters within sentences to form a new word.

* Word-in-Sentences: This highlights the target word being hidden within the sentences.

* Sentence Word Puzzle: This adds a playful element to the activity, suggesting it's a type of puzzle.

You could also use a more creative term like "Sentence Cipher" or "Word Mosaic" if you're looking for something more unique.

Ultimately, the best term depends on the specific context and your desired level of formality.