Ok so I'm very, very wrong along another semantic axis but in this context it's absolutely irrelevant, using the definition given in the second paragraph:
> In the kinetic theory of gases, the term molecule is often used for any gaseous particle regardless of its composition. According to this definition, noble gas atoms are considered molecules despite being composed of a single non-bonded atom.
Unless you're saying that water (or any other molecule for that matter) can form inside of a star, which would open an entirely new field of chemistry, this is the definition to use when talking about astrophysics.
> In the kinetic theory of gases, the term molecule is often used for any gaseous particle regardless of its composition. According to this definition, noble gas atoms are considered molecules despite being composed of a single non-bonded atom.
Unless you're saying that water (or any other molecule for that matter) can form inside of a star, which would open an entirely new field of chemistry, this is the definition to use when talking about astrophysics.