ambulatory (n.) Look up ambulatory at Dictionary.com
from Medieval Latin ambulatorium, from Latin ambulatorius "movable," from ambulare (see amble).
ambulatory (adj.) Look up ambulatory at Dictionary.com
"pertaining to walking;" also "shifting, not permanent," 1620s, from Latin ambulatorius "of or pertaining to a walker; movable," from ambulator, agent noun from past participle stem of ambulare "to walk" (see amble). Middle English had ambulary "movable" (mid-15c.).