Lacking height and depth

• Like a line, to a math student
• Like a line segment, briefly
• Like a line, briefly
• Linear, to a mathematician
• Like a line, to a math prof
• Having only length, briefly
• Lacking width and depth, briefly
• Like lines, briefly
• Like a line, for short

Wiktionary Word definitions in Wiktionary
vb. (en-past of: one )