Alternative spelling of lifehack

plural of hair pin

Alternative form of hairpin

plural of habitable zone

plural of galactic habitable zone

(astrobiology, astronomy) the restricted zone around a sun where the ever shifting habitable zone is always present throughout the main sequence lifetime of that star.

plural of continuously habitable zone

(astrobiology, astronomy) the zone in a disk galaxy lying within the disk which is neither too far from the core so as to be lacking in heavier elements, nor too close to the core as to experience excessive exposures to supernovae, where intelligent life may develop

simple past tense and past participle of have it coming

(surveying) In a theodolite, etc., one of the horizontal crosshairs equidistant from the central horizontal crosshair.