alga
UK[ˈælɡə]US[ˈælɡə]
n
A simple, non-flowering plant that grows in or near water, including seaweeds and many single-celled forms.
Etymology
The word 'alga' entered English directly from Latin in the mid-16th century, where 'alga' (plural 'algae') referred specifically to seaweed. The Latin term's origin is uncertain, but it is likely connected to the concept of coldness or chill, perhaps from a Proto-Indo-European root meaning 'cold', possibly alluding to the cool, wet habitats of these plants. This etymological thread suggests a descriptive logic, naming the organism by its environment. Over time, its scientific and general usage expanded to encompass all simple, aquatic, photosynthetic organisms, from massive kelps to microscopic plankton, while retaining its core association with water-dwelling plant life.
Analysis
The word 'alga' is a simplex loanword from Latin. It is the singular form of the Latin noun 'algae', meaning 'seaweed'.
Examples
The pond was covered with a green film of alga.
A single alga can multiply rapidly under the right conditions.
Scientists studied the marine alga for its potential biofuel properties.