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The Collaborative International Dictionary
Alga

Alga \Al"ga\, n.; pl. Alg[ae] or algae. [L., seaweed.] (Bot.) A kind of seaweed; pl. the class of cellular cryptogamic plants which includes the black, red, and green seaweeds, as kelp, dulse, sea lettuce, also marine and fresh water conferv[ae], etc. The algae are primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.

Douglas Harper's Etymology Dictionary
alga

see algae.

Wiktionary
alga

n. (context biology English) Any of many aquatic photosynthetic organisms, whose size ranges from a single cell to giant kelps and whose form is very diverse; some are eukaryotic and some prokaryotic; includes the seaweeds.

WordNet
alga

n. primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves [syn: algae]

Wikipedia
Alga (disambiguation)

Some places named Alga are:

Usage examples of "alga".

They were gradually adapting to living off algae they strained out of seawater.

But a simpler interpretation of the data suggests it to have been a purely physical effect caused by DDT particles adsorbing to the outside surfaces of the algae and cutting down the light supply.

The bus stops were built of tall glass tubes, aquaculture cylinders, murky green soups full of algae and fat, sluggish carp.

He talked microbes and biofilms and bacterial communities even when they reached the protruding tongue of slick, black stones leading into the first cave, even during all the business of docking and handing her over the side and mentioning that she just might want to watch out for the algae that made the cave entrance so slippery and oops, I forgot to mention that little bump just inside.

Eventually, those algae became the chloroplasts that now handle the processes of photosynthesis in plants.

And they were descended from primordial bacteria just as chloroplasts were from algae.

Vlad called a mix and match program, and recently they had come up with a variant of the cyanophyte that was sometimes called bluegreen algae.

I have not been provided with digitized examples or programs of appropriate animal sea life beyond algae.

There is a swimming pool and a fishpond behind the house, but these bodies of water are a stubborn, frothing, seething mess of algae in which monitor lizards float, their small faces hiding their large, hanging bodies, and in which there are scorpions and frogs in staggering numbers.

Algae did the rest, painting the geyserite in all the hues of the rainbow.

A sixty-centimetre stratum of water had been sandwiched between the spongy mud and lathery algae.

The striations contain the chlorophyll, and the little spheres nestling against these striations contain the phycobilins, which make a red alga red.

The stream was muddy, its stones slimed with algae, none of which seemed to bother the horses.

The vegetation which actually oxidized the saturated hydrocarbons of Mesklinite biological waste and gave off free hydrogen was represented by a variety of unicellular species corresponding as nearly as might be expected to terrestrial algae.

On Plates VII and VIII two kinds of unicellular organisms are shown, of one which - the green algae - is accustomed to live in light, the other - the bacilli - in darkness.