tri-ovenable
adj. Of or relating to a product or material that can withstand the heat generated by conventional, microwave, or toaster ovens.

Example Citation:
The Vancouver, Wash.,-based trade association pointed out that besides being fabricated from the most recycled material in the world, aluminum foil containers are consumer friendly and 'tri-ovenable' — they can be placed in conventional, microwave or toaster ovens for heating without melting, charring or compromising the food's flavor.
—"Container makers enhance Web site," American Metal Market, April 12, 2001

Earliest Citation:
Aluminum foil containers are advantageous for a number of reasons, such as: ...

  • Tri-Ovenable: Foods in aluminum foil containers can be placed in microwave, conventional, or toaster ovens for heating without melting, charring or compromising the food's flavor.

  • —"Aluminum Foil Containers — Nearly Seven Billion Used in U.S. & Canada," Business Wire, April 10, 2001

Notes:
The distinction between the heat generated by a conventional oven and that generated by a toaster oven is lost on me, so the prefix tri- used in today's word carries a whiff of hyperbole. This is reinforced by the relative popularity of the word dual-ovenable, "Able to withstand the heat of conventional or microwave ovens," which is also much older:

Just as the television commercials claim, dual-ovenable products (for microwave or conventional ovens) provide a convenience today's consumer desires--terrific results with no preparation or mess.
—Jacqueline Benner, "Convenience breeds success for frozen food packagers," Quick Frozen Foods, July, 1984
Wondering about the adjective ovenable, "Able to withstand the heat of a conventional oven"? I thought so. I managed to trace it back to 1977:

It uses the 'ovenable' paperboard as an outer package and instructs the consumer to put the whole thing directly in the oven.
—"A paperboard container that's oven-resistant," Business Week, November 21, 1977

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