opera-tory

op·er·a·to·ry

[op-er-uh-tawr-ee, -tohr-ee] noun, plural op·er·a·to·ries, adjective
noun
1.
a room or other area with special equipment and facilities, as for dental surgery, scientific experiments, or the like.
adjective

Origin:
1645–55; operate + -ory1, -ory2; compare Late Latin operātōrius working, acting

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Opera-tory is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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