sideways supine[as in laying in bed]
Horizontal position is strate 90 degree
A line
Horizontal is an adjective meaning "of, relating to or near the horizon."
horizontal expansion A+
The horizontal cross section of a rectangular pyramid is a rectangle.
posterior is similar in meaning to what?
similar meaning
Poly has a similar meaning with multi-.
It would be a rectangle that is similar to the base.
The horizontal line above vowels means the letter is a long vowel.
Representative has a similar meaning to iconic.
similar in meaning to expedite.