| rhizoma | <botany> Same as rhizome. (23 Aug 1998) |
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| rhizomatous | <botany> Having the nature or habit of a rhizome or rootstock. Source: Websters Dictionary (01 Mar 1998) |
| rhizome | <plant biology> A horizontal underground stem which can send out both shoots and roots, rhizomes sometimes have thickened areas that store starch. (23 Aug 1998) |
| rhizome chaff | <botany> Mechanically chopped-up pieces of thin rhizomes spread on the ground and covered with soil so they can take root and form new plants. (23 Aug 1998) |
| rhizome cutting | <botany> Part of a thick rhizome, which may take root and form a new plant. (23 Aug 1998) |
| rhizomelia | 1. Disproportion in the length of the most proximal segment of the limbs (upper arms and thighs). 2. A disorder involving the shoulder and hip joint. Origin: rhizo-+ G. Melos, limb (05 Mar 2000) |
| rhizomeningomyelitis | Inflammation of the nerve roots, the meninges, and the spinal cord. Synonym: radiculomeningomyelitis. Origin: rhizo-+ G. Meninx, membrane, + myelon, marrow, + -itis, inflammation (05 Mar 2000) |
| rhizophaga | <zoology> A division of marsupials. The wombat is the type. Source: Websters Dictionary (01 Mar 1998) |
| rhizophora | <botany> A genus of trees including the mangrove. See Mangrove. Origin: NL. See Rhizophorous. Source: Websters Dictionary (01 Mar 1998) |
| rhizophore | <plant biology> A leafless stem that produces roots. (23 Aug 1998) |
| rhizophorous | <botany> Bearing roots. Origin: Gr. A root + to bear. Source: Websters Dictionary (01 Mar 1998) |
| rhizoplast | <biology> Striated contractile structure attached to the basal region of the cilium in a variety of ciliates and flagellates. May regulate the flagellar beat pattern and is sensitive to calcium concentration. Composed of a 20 kD protein rather similar to spasmin. (23 Aug 1998) |
| rhizopod | <zoology> One of the Rhizopoda. The rhizopods belonging to the Radiolaria and Foraminifera have been of great geological importance, especially in the Cretaceous and Tertiary periods. Chalk is mostly made from the shells of Foraminifera. The nummulites are the principal ingredient of a limestone which is of great extent in Europe and Asia, and is the material of which some of the pyramids of Egypt are made. The shells are abundant in deepsea mud, and are mostly minute, seldom larger than a small grain of sand, except in the case of the nummulities, which are sometimes an inch in diameter. (23 Aug 1998) |
| rhizopoda | <zoology> An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Amoebea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See Protozoa. Origin: NL, fr. Gr. A root + -poda. Source: Websters Dictionary (01 Mar 1998) |
| Rhizopodasida | <zoology> An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Amoebea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See Protozoa. Origin: NL, fr. Gr. A root + -poda. Source: Websters Dictionary (01 Mar 1998) |