- 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 algal
Contemporary Examples of algal
Earlier this month, Toledo, Ohio, watched its municipal water supply descend into an undrinkable stew of algal toxins.Are Water Filters B.S.?
August 19, 2014
Historical Examples of algal
The algal host cells lie in the medulla, just below the upper cortex.
The chains of cells are usually badly broken up, and the nature of the algal host is, therefore, difficult to distinguish.
The algal hosts are usually Dactylococcus or Polycoccus, and both hosts are sometimes found in the same thallus.
It was, therefore, most desirable to devise a method of ridding the bed of algal growth without injuring the cress.
This only killed the algal growth with which the particles of copper came in contact and left the main body of alg unaffected.
- 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 for algae
Word Origin and History for algal
(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.