The Collaborative International Dictionary of English. 2000.
Pyrethrin — Pyr eth*rin, n. [NL. Pyrethrum, generic name of feverfew, Gr. ? feverfew.] (Chem.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; called also {Pyrethrum camphor}. [1913 Webster] … The Collaborative International Dictionary of English
herbaceous plant — noun a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests • Syn: ↑herb • Derivationally related forms: ↑herbal (for: ↑herb) • Hypernyms: ↑ … Useful english dictionary
genus Tanacetum — noun a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum • Syn: ↑Tanacetum • Hypernyms: ↑asterid dicot genus • Member Holonyms: ↑Compositae, ↑family Compositae, ↑ … Useful english dictionary
Tanacetum — noun a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum • Syn: ↑genus Tanacetum • Hypernyms: ↑asterid dicot genus • Member Holonyms: ↑Compositae, ↑family… … Useful english dictionary
Insect repellent — Mosquito on a bottle of herbal mosquito repellent. An insect repellent is a substance applied to skin, clothing, or other surfaces which discourages insects (and arthropods in general) from landing or climbing on that surface. There are also… … Wikipedia
Plant defense against herbivory — Poison ivy produces urushiol to protect the plant from herbivores. In humans this chemical produces an allergic skin rash, known as urushiol induced contact dermatitis … Wikipedia
East African mountains — ▪ mountains, East Africa Introduction mountain region (eastern Africa) of Kenya, Tanzania, Uganda, Congo (Kinshasa) (Congo), Rwanda, and Burundi. The mountains are intimately related to the East African … Universalium
