Related Clues:

• Like a plane, for short
• Like the x- or y-axis
• Going along the line, briefly?
• Linear, in brief
• Like the x- or y-axis briefly,
• Having no depth briefly,
• Lacking depth, briefly
• Having no depth, briefly
• Superficial, for short
• Like the x-, y- or z-axis
• Linear, informally
• Having no width or depth
• Depthless, for short
• Like straight lines, for short
• Lacking height and depth, for short