| iron-storage protein | <chemical> Soluble iron storage protein from e coli; different from ferritin and haemosiderin (05 Dec 1998) |
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| iron-sulfur proteins | A group of proteins possessing only the iron-sulfur complex as the prosthetic group. These proteins participate in all major pathways of electron transport: photosynthesis, respiration, hydroxylation and bacterial hydrogen and nitrogen fixation. (12 Dec 1998) |
| ironbark tree | <botany> The Australian Eucalyptus Sideroxylon, used largely by carpenters and shipbuilders. Synonym: ironwood. Source: Websters Dictionary (01 Mar 1998) |
| ironheads | <botany> A European composite herb (Centaurea nigra); so called from the resemblance of its knobbed head to an iron ball fixed on a long handle. Source: Websters Dictionary (01 Mar 1998) |
| ironsmith | 1. A worker in iron; one who makes and repairs utensils of iron; a blacksmith. 2. <zoology> An East Indian barbet (Megalaima faber), inhabiting the Island of Hainan. The name alludes to its note, which resembles the sounds made by a smith. Source: Websters Dictionary (01 Mar 1998) |
| ironweed | <botany> A tall weed with purplish flowers (Vernonia Noveboracensis). The name is also applied to other plants of the same genus. Source: Websters Dictionary (01 Mar 1998) |
| ironwood | <botany> A tree unusually hard, strong, or heavy wood. In the United States, the hornbeam and the hop hornbeam are so called; also the Olneya Tesota, a small tree of Arizona; in the West Indies, the Erythroxylon areolatum, and several other unrelated trees; in China, the Metrosideros vera; in India, the Mesua ferrea, and two species of Inga; in Australia, the Eucalyptus Sideroxylon, and in many countries, species of Sideroxylon and Diospyros, and many other trees. Source: Websters Dictionary (01 Mar 1998) |
| ironwort | <botany> An herb of the Mint family (Sideritis), supposed to heal sword cuts; also, a species of Galeopsis. Source: Websters Dictionary (01 Mar 1998) |
| irony | 1. Made or consisting of iron; partaking of iron; iron; as, irony chains; irony particles. 2. Resembling iron taste, hardness, or other physical property. Origin: From Iron. Source: Websters Dictionary (01 Mar 1998) |