A sickle is a tool that is used for cutting grass and grain crops. It has a short handle and a long curved blade. a tool with a blade in the shape of a hook, used for cutting wheat or long grass
A knife – typically with a short handle and a curved blade in the shape of a question-mark – which might have been used to harvest cereals and other vegetation See Billhook, Reaping hook, Scythe
A reaping instrument consisting of a steel blade curved into the form of a hook, and having a handle fitted on a tang
an implement having a semicircular blade attached to a short handle, used for cutting grain or tall grass
{i} agricultural tool consisting of a curved blade attached to a short handle (used to cut grass, wheat, etc.)
An abnormal, crescent-shaped red blood cell that results from a single change in the amino acid sequence of the cell's hemoglobin, which causes the cell to contort, especially under low-oxygen conditions
(Medicine) hereditary disease characterized by anemia resulting from defective hemoglobin production (causes deformed red blood cells, oxygen deficiency, and circulatory problems)
A chronic, usually fatal anemia marked by sickle-shaped red blood cells, occurring almost exclusively in Black people of Africa or of African descent, and characterized by episodic pain in the joints, fever, leg ulcers, and jaundice. The disease occurs in individuals who are homozygous for a mutant hemoglobin gene. Also called sickle cell disease
sickle-cell anaemia in AM, use sickle-cell anemia Sickle-cell anaemia is an inherited illness in which the red blood cells become curved, causing a number of health problems. sickle-cell anemia a serious illness that mainly affects black people, in which the blood cells change shape, causing weakness and fever
Blood disorder (see hemoglobinopathy) seen mainly in persons of Sub-Saharan African ancestry and their descendants and in those from the Middle East, the Mediterranean area, and India. About 1 in 400 blacks worldwide has the disease, caused by inheriting two copies of a recessive gene that makes those with one copy (about 1 in 12 blacks worldwide) resistant to malaria. The gene specifies a variant hemoglobin (hemoglobin S or Hb S) that distorts red blood cells (erythrocytes) into a rigid sickle shape. The cells become clogged in capillaries, damaging or destroying various tissues. Symptoms include chronic anemia, shortness of breath, fever, and episodic "crises" (severe pain in the abdomen, bones, or muscles). Hydroxyurea treatment triggers production of fetal hemoglobin (Hb F), which does not sickle, greatly lessening severity of crises and increasing life expectancy, previously about 45 years