Silybum
— Noun
– English
~ small genus of east African herbs
Silybum marianum
— Noun
– English
~ tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
Simarouba glauca
— Noun
– English
~ medium to large tree of tropical North and South America having odd-pinnate leaves and long panicles of small pale yellow flowers followed by scarlet fruits
Simarouba amara
— Noun
– English
~ tree of the Amazon valley yielding a light brittle timber locally regarded as resistant to insect attack
Simarouba
— Noun
– English
~ type genus of Simaroubaceae; tropical American trees and shrubs having a pale soft wood and bitter bark
Simaroubaceae
— Noun
– English
~ chiefly tropical trees and shrubs with bitter bark having dry usually one-seeded winged fruit
simazine
— Noun
– English
~ a herbicide used to control weeds (especially among crops)