What is a "lifeguard"?

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I was reading a transcript from the TWA 800 flight that crashed in New York in '96. They mentioned to tower that were a lifeguard and I am not familiar with what that means.

Also, which planes in the Boeing fleet are referred to as "heavies"? Am I right to assume everything above the 737?

Finally, I know that the 737 has a tiller on the captain's side only. What about the 757/767/747/777?

Thanks very much

[PaperTiger]

"lifeguard" callsign prefix = aircraft carrying urgent medical cargo (usually a transplant organ).

"medivac" callsign prefix = aircraft carrying live patient(s)

[Localiser Green]

"Also, which planes in the Boeing fleet are referred to as "heavies"? Am I right to assume everything above the 737?"

767 and above with the Boeings. It's related to MTOW I recall. A 757 is not "heavy" but "medium" (like a 737).

"Finally, I know that the 737 has a tiller on the captain's side only. What about the 757/767/747/777?"

Company option I think. I know BA 757s and 767s have a tiller on both sides and the handling pilot does the taxy at both ends.

Airbus A320/330 etc have tillers on both sides. Standard Airbus procedure is (quite rightly) for handling pilot on that sector to taxy too. Some airlines who fly Airbus are stuck in Boeing SOPs though and still require the Captain to taxy regardless of who is FP for the sector.

[Onan the Clumsy]

What about "wide body" Is that a configuration with two aisles?

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Thanks everyone for the info!