algae (n.)Related entries & more
(plural), 1794, from alga (singular), 1550s, from Latin alga "seaweed," which is of uncertain origin. Perhaps connected to Latin ulva "grass-like or rush-like aquatic plant," or perhaps from a PIE root meaning "to putrefy, rot," but de Vaan considers this unlikely and suggests it might be a foreign loan-word.
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algologist (n.)Related entries & more
phytoplankton (n.)Related entries & more
phycology (n.)Related entries & more
volvox (n.)Related entries & more
genus of fresh-water algae, 1798, from Latin volvere "to roll," from PIE root *wel- (3) "to turn, revolve." So called from their motion.
prokaryotic (adj.)Related entries & more
Red Sea (n.)Related entries & more
the Greek thalassa erythra; the reason for the name is unknown; speculation has traced it to: 1. algae in coastal waters; 2. sandstone rock formations on the shores; 3. a tribal name; 4. ancient association of "red" with "south" (as "black" with "north").
thallus (n.)Related entries & more
1829, Latin, from Greek thallos "green shoot, young branch, twig," related to thalia "abundance," thalos "scion, child," ultimately from PIE root *dhal- "to bloom" (source also of Armenian dalar "green, fresh," Albanian dal' "I sprout," Old Irish duilesc, a type of algae).