1. keyholing - Noun
2. keyholing - Verb
keyholing
present participle of keyhole
(firearms) The tendency of a bullet fired down an excessively large barrel to wobble in flight and leave a keyhole-shaped puncture in the target.
(lasers) The formation of a transient column of vapor or plasma when using high energy beams, such as lasers, for welding or cutting.
Source: en.wiktionary.org