Answer:

yaxis

Answer	Crossword Clue
YAXIS	Algebraic reference line
YAXIS	Vertical graph line
YAXIS	Graph line

YAXIS	Graph part
YAXIS	Plot line
YAXIS	How height may be measured
YAXIS	Vertical reference line on a graph
YAXIS	Vertical graph component
YAXIS	Vertical line on a graph
YAXIS	Part of a plane
YAXIS	Graph component

YAXIS	Plane part
YAXIS	It goes up and down
YAXIS	Geometric vertical
YAXIS	Plotter's line, perhaps
YAXIS	Graph mainstay
YAXIS	Graph vertical
YAXIS	Cartesian line
YAXIS	Side of a Cartesian quadrant

YAXIS	Vertical part of a plane