ragweed

名词 n.
中文释义
美 /ˈɹæɡˌwid/

英文释义

名词 n.
  1. A plant of the genus Ambrosia. These weeds are particularly noted for producing pollen that triggers hay fever. countable,uncountable
    — Fig. 1.—Spiculated pollens of ragweeds (ambrosias) low in protein. […] In the cocklebur (Xanthium americanum) and the rough wild elder (Iva ciliata), the spicules are shorter, being 0.7 and 0.5 microns, and the reaction is proportionately less active than with the ragweeds (ambrosias). […] While the grass pollens have so light a coat that they are frequently crushed in the ordinary process of mounting, the ragweed (ambrosias) pollen grains resist pressure between two glass slides carried to the point of crushing the glass.
  2. A summer cypress, mock cypress (Bassia scoparia). countable,uncountable

词形变化

ragweeds plural

词汇关系

衍生词
annual ragweed coastal ragweed common ragweed common ragweed fruit fly Cuman ragweed dwarf bur ragweed flatspine burr ragweed giant ragweed great ragweed lacy ragweed lanceleaf ragweed minute ragweed borer perennial ragweed Peruvian ragweed ragweed gall mite ragweed borer moth ragweed flower moth ragweed leaf beetle ragweed plume moth ragweed weevil San Diego ragweed silver burr ragweed Tucson bur ragweed weakleaf bur ragweed western ragweed

词源

From rag + weed. Compare Middle English ragwed (“butcher's broom”).
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