| quack grass | <botany> See Quitch grass. Source: Websters Dictionary (01 Mar 1998) |
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| quitch grass | <botany> A perennial grass (Agropyrum repens) having long running rootstalks, by which it spreads rapidly and pertinaciously, and so becomes a troublesome weed. Also called couch grass, quick grass, quick grass, twitch grass. Origin: Properly quick grass, being probably so called from its vigorous growth, or from its tenacity of life. See Quick, and cf. Couch grass. Source: Websters Dictionary (01 Mar 1998) |
| oil of lemon grass | Volatile oil from Cymbopogon citratus and of C. Flexuosus (family Gramineae). Used in perfumery and as a source of citral for the synthesis of vitamin A. (05 Mar 2000) |
| timothy grass | <botany> A kind of grass (Phleum pratense) with long cylindrical spikes; called also herd's grass, in England, cat's-tail grass, and meadow cat's-tail grass. It is much prized for fodder. Origin: From Timothy Hanson, who carried the seed from New England to Maryland about 1720. Source: Websters Dictionary (01 Mar 1998) |
| twitch grass | <botany> See Quitch grass. Source: Websters Dictionary (01 Mar 1998) |
| johnson grass | <botany> A tall perennial grass (Sorghum Halepense), valuable in the Southern and Western States for pasture and hay. The rootstocks are large and juicy and are eagerly sought by swine. Synonym: Cuba grass, Means grass, Evergreen millet, and Arabian millet. Origin: Named after W. Johnson of Alabama, who planted it about 1840-1845. Source: Websters Dictionary (01 Mar 1998) |
| lyme grass | <botany> A coarse perennial grass of several species of Elymus, especially. E. Canadensis, and the European E. Arenarius. Source: Websters Dictionary (01 Mar 1998) |
| actinic dermatitis | Dermatitis caused or elicited by exposure to sunlight; may be phototoxic or photoallergic, and can result from topical application, ingestion, inhalation, or injection of mediating phototoxic or photoallergic material. See: photosensitization. Synonym: actinic dermatitis, actinodermatitis. Origin: photo-+ G. Derma, skin, + -itis, inflammation (05 Mar 2000) |
| allergic contact dermatitis | A delayed type IV allergic reaction of the skin with varying degrees of erythema, oedema, and vesiculation resulting from cutaneous contact with a specific allergen. Synonym: contact allergy. (05 Mar 2000) |
| ancylostoma dermatitis | Cutaneous larva migrans caused by larvae of hookworms. Synonym: ancylostoma dermatitis, ancylostomiasis cutis, coolie itch, dew itch, ground itch, swamp itch, swimmer's itch, toe itch, water itch, water sore. (05 Mar 2000) |
| atopic dermatitis | <dermatology> A type of immune-mediated (allergic) inflammatory skin disorder that results in a itchy rash. See: atopic eczema. (27 Sep 1997) |
| berloque dermatitis | Berlock dermatitis, a type of photosensitization resulting in deep brown pigmentation on exposure to sunlight after application of bergamot oil and other essential oils in perfume. (05 Mar 2000) |
| blastomycetic dermatitis | A cutaneous form of blastomycosis. (05 Mar 2000) |
| bubble gum dermatitis | Allergic contact dermatitis developing about the lips in children who chew bubble gum; caused by plastics in the gum substance. (05 Mar 2000) |
| papular dermatitis of pregnancy | Intensely pruritic papular eruption of torso and extremities occurring throughout pregnancy, with no systemic toxicity; may be similar to pruritic urticarial papules and plaques of pregnancy. (05 Mar 2000) |