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Sistered beams:
Take say two 2x10's. Place them end to end. Now overlap/stack the two ends by say 10" to 1'. Now they are sistered. Nail or screw them like that with wood glue, and they will act like a single beam in many instances.
Your floor joists are made like this.
Glue lam:
Not even lumber. Kind of like plywood, but not. Far stronger, engineered, expensive. Made from wood, but not the kind of thing you go down to home depot to buy. You'll need to source them from a good lumber yard. Strong, also, ugly.
Glue lam I beams are made from wood parts, and are at around 1/2 the compresive weight and span ability of same size steel. That's impressive.
Actual lumber:
exactly what you think I mean.
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