1. Ses graines très appréciées des oiseaux donnent une huile peu prisée.
2. Produit coloré que l'on utilise en chimie pour distinguer rapidement un acide d'une base.
ETYM Dutch lakmoes; lak lacker + moes a thick preparation of fruit, pap, prob. akin to Eng. meat: cf. German lackmus. Related to Lac a resinous substance.
Dye obtained from lichens, used in chemical tests, being turned red by acid and blue by alkali.
A coloring material that turns red in acid solutions and blue in alkaline solutions; used as an acid-base indicator.
Dye obtained from various lichens and used in chemistry as an indicator to test the acidic or alkaline nature of aqueous solutions; it turns red in the presence of acid, and blue in the presence of alkali.
(Hélianthe entre autres) Plante ŕ grande fleur jaune ainsi nommée parce qu'elle se tourne du côté du soleil.
Tall plant of the genus Helianthus, family Compositae. The common sunflower H. annuus, probably native to Mexico, grows to 4.5 m/15 ft in favorable conditions. It is commercially cultivated in central Europe, the US, Russia, Ukraine, and Australia for the oil-bearing seeds that follow the yellow-petalled flowers.Any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays; SYN. helianthus.