Concrete Canoe. The Greek polymath Archimedes is said to have solved the mystery of buoyancy in a bathtub. Even if the story is apocryphal, his principle isn't: If an object weighs less than the water it displaces, it won't sink. Even concrete can float. Materials scientist Joseph-Louis Lambot built a concrete dinghy featured in the 1855 World's Fair.
Definition of BIOFILTER. : a filter bed in which sewage is subjected to the action of microorganisms that assist in decomposing it. ADVERTISEMENT. 2bi- + filter.rigin of BIOFILTER. 2bi- + filter. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis.
Falter means to hesitate, stumble, or waver, and everything from faith to voices can do it. So if you want to keep your bride or groom happy, it's best not to falter when it's your turn to say I do.. Experts may falter if you ask them where falter came from, because the origins are pretty unclear. But everyone agrees on the current meaning: someone who falters is unsteady, wobbly, or unsure. You might falter while reciting a poem if you forget some of the lines, or falter crossing a rickety rope bridge when fear gets the most of you. But you certainly won't falter when someone asks you the meaning of this word.