- any of numerous groups of chlorophyll-containing, mainly aquatic eukaryotic organisms ranging from microscopic single-celled forms to multicellular forms 100 feet (30 meters) or more long, distinguished from plants by the absence of true roots, stems, and leaves and by a lack of nonreproductive cells in the reproductive structures: classified into the six phyla Euglenophyta, Crysophyta, Pyrrophyta, Chlorophyta, Phaeophyta, and Rhodophyta.
Origin of algae
Examples from the Web for algae
We would have considered an algae bloom to be a welcome sign of ecological renewal.Toledo: The Town Too Tough for Toxic Water
P. J. O’Rourke
August 4, 2014
Algae, sponges and coral now cover nuns, small children, and the elderly upper class.Artist Jason deCaires Taylor’s Underwater Sculptures Are a Sight to Sea
April 7, 2014
Glowing bacteria might live in our ceilings and light our homes, while algae bioreactors could supply food and fuel.It’s the End of the World but We’ll Be Fine
May 18, 2013
Newt Gingrich has been scoring points ridiculing the idea of algae as a fuel of the future.Gas from Algae? Hilarious!
March 16, 2012
The rainbow of life in a coral reef is founded on the partnership between polyps and algae.Here on Earth, The Forgotten Founding Father, and Other Reviews
The Daily Beast
April 30, 2011
As far as they could see there was no algae in sight, the water was one glassy blue.The Cruise of the Dry Dock
T. S. Stribling
The simplest form of vegetation is algae which grows on the sides of the tank.Boy Scouts Handbook
Boy Scouts of America
He regarded a bowl of algae as if about to make it disappear.Greener Than You Think
We've put quite a dent in the algae and synthetics operations in this sector.The Lani People
J. F. Bone
The Carrageen or Iceland moss, or lichen is one of the algae of the sea.The Progress of the Marbling Art
- unicellular or multicellular organisms formerly classified as plants, occurring in fresh or salt water or moist ground, that have chlorophyll and other pigments but lack true stems, roots, and leaves. Algae, which are now regarded as protoctists, include the seaweeds, diatoms, and spirogyra
Word Origin and History for algae
(plural), 1794, from alga (singular), 1550s, from Latin alga "seaweed," of uncertain origin, perhaps from a PIE root meaning "to putrefy, rot."
- Any of various chiefly aquatic, eukaryotic, photosynthetic organisms, ranging in size from single-celled forms to the giant kelp.
- Any of various green, red, or brown organisms that grow mostly in water, ranging in size from single cells to large spreading seaweeds. Like plants, algae manufacture their own food through photosynthesis and release large amounts of oxygen into the atmosphere. They also fix large amounts of carbon, which would otherwise exist in the atmosphere as carbon dioxide. Algae form a major component of marine plankton and are often visible as pond scum and blooms in tidal pools. Land species mostly live in moist soil and on tree trunks or rocks. Some species live in extreme environments, such as deserts, hot springs, and glaciers. Although they were once classified as plants, the algae are now considered to be protists, with the exception of the cyanobacteria, formerly called blue-green algae. The algae do not form a distinct phylogenetic group, but the word alga serves as a convenient catch-all term for various photosynthetic protist phyla, including the green algae, brown algae, and red algae.