HEADSPACE
headspace
(noun) the volume left at the top of a filled container (bottle or jar or tin) before sealing
Source: WordNet® 3.1
Etymology
Noun
headspace (countable and uncountable, plural headspaces)
The space between the top of the contents of a container (such as a jar) and its seal (such as a lid).
(informal) One's mental state.
(informal) Unscheduled time for reflection and thinking.
(firearms) The gap between the face of the bolt and the stopping surface for the cartridge.
(chemistry) The gas phase in contact and in equilibrium with a nonvolatile sample.
Verb
headspace (third-person singular simple present headspaces, present participle headspacing, simple past and past participle headspaced)
(firearms) To occupy a headspace.
Anagrams
• spacehead
Source: Wiktionary