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“horizontal”
horizontal (adjective), more horizontal, most horizontal
Parallel to the floor; a plane that passes through the standing body that is parallel to the floor: The lines in her diary were all horizontal, and easy to write on.
This entry is located in the following unit:
Medical Orientation Words with Reference to the Body
(page 1)
(there are certain anatomic terms which present various situations; for example, a body part may be horizontal, as opposed to vertical; in front as opposed to being behind or at the back; above as opposed to being under, etc.)