Not Solid or Liquid
This page is the CodyCross answer for the clue below from World of Books, Group 281, Puzzle 1 (Bookshelves).
Question is: Not Solid or Liquid
and the answer is: GASEOUS
Word Meaning:
GASEOUS — Relating to, or existing as gas (matter in an intermediate state between liquid and plasma).
Definitions from Wiktionary.