Noun
a line that indicates a boundary
Source: WordNet3.2: A shuttlecock of the correct speed will land not less than 530 mm and not more than 990 mm short of the other back boundary line. Source: Internet
A 1771-1780 map of Virginias counties, shows Hampshire County, but the Virginia State boundary has Hampshire outside that boundary line. Source: Internet
As fare would have it, both the openers suffered from on-field injuries — Dhawan being hit on rib-cage trying to fend a Pat Cummins bouncer while Rohit got a jerk on his shoulder while trying go field at the boundary line. Source: Internet
"Attacking" balls on the boundary line to bring them into play is thus far more challenging. Source: Internet
Badminton rules also provide for testing a shuttlecock for the correct speed: 3.1: To test a shuttlecock, hit a full underhand stroke which makes contact with the shuttlecock over the back boundary line. Source: Internet
For the midpoint square intersection the resulting boundary line traverses every face of the tetrahedron similarly. Source: Internet