a made-up
phrase of words that have meaning but are meaningless in this combination. An alidade is an
indicator or sighting apparatus used for measuring angles. Amplitude means "largeness, width,
breadth or size."
Dihedral is a mathematical
term meaning "
having or formed by two
plane surfaces which
meet along an
edge." (An
example of a
dihedral angle is the angle formed by the pages of a book where they join along the spine.)
Betwixt is an archaic
word meaning "between."
—SHSBC Binder 13 Approved Glossary, —HSSC Glossary (Final approval 3-9-90), —Academy Level 0 Glossary Approved 3-12-90