| sickle form | The male or female gametocyte(s) of Plasmodium falciparum, whose presence in human red blood cells is diagnostic of falciparum malaria. Synonym: crescent, sickle form. Myopic crescent, a white or grayish white crescentic area in the fundus of the eye located on the temporal side of the optic disk; caused by atrophy of the choroid, permitting the sclera to become visible. Synonym: myopic conus. Sublingual crescent, the crescent-shaped area on the floor of the mouth formed by the lingual wall of the mandible and the adjacent part of the floor of the mouth. (05 Mar 2000) |
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| sickle scotoma | A comet-shaped scotoma, occurring in glaucoma, attached at the temporal end to the blind spot or separated from it by a narrow gap; the defect widens as it extends above and nasally curves around the fixation spot, and then extends downward to end exactly at the nasal horizontal meridian. Synonym: Bjerrum's sign, sickle scotoma. (05 Mar 2000) |
| sicklebill | <ornithology> Any one of three species of humming birds of the genus Eutoxeres, native of Central and South America. They have a long and strongly curved bill. Synonym: the sickle-billed hummer. A curlew. A bird of the genus Epimachus and allied genera. Source: Websters Dictionary (01 Mar 1998) |
| sickless | Free from sickness. "Give me long breath, young beds, and sickless ease." (Marston) Source: Websters Dictionary (01 Mar 1998) |
| sicklewort | <botany> A plant of the genus Coronilla (C. Scorpioides); so named from its curved pods. The healall (Brunella vulgaris). Origin: AS. Sicolwyrt. Source: Websters Dictionary (01 Mar 1998) |