This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of null.

n. The act or process of forming nulls: as, a nulling -lathe; a nulling- tool.

"Using a technique called nulling interferometry, they hope to be able to find the first Earth-like planet orbiting a star."

invalid   

nulled    nulling    nulls   

null element    null ouvert    null method    null tourné    grand null ouvert    nulled work    nil   

annul   

nullity   

invalid    void    nugatory    useless    empty    cipher    zero    annul    trifling    nonexistent   

Hull    Mull    Shull    crull    cul    cull    dull    gul    gull    hull   

valid    optional    static    numeric    32-bit    &&    invalid    negligible    multiple    erroneous