Gonad. Definition. noun, plural: gonads. The sex organ producing gametes. Supplement. The gonads pertain to the anatomical part of the body where sex cells (gametes) are synthesized. For instance, the gonads in females are the ovaries whereas in males are the testes.Word origin: from Greek gonos, procreation, genitals.onad. Definition. noun, plural: gonads. The sex organ producing gametes. Supplement. The gonads pertain to the anatomical part of the body where sex cells (gametes) are synthesized. For instance, the gonads in females are the ovaries whereas in males are the testes.
Water is considered hard when the pH level is above 8.5. Hard water does not pose a health risk, but can cause aesthetic problems such as: 1  Bitter taste to the water and beverages such as tea or coffee. 2  Scales on piping and fixtures that reduces the internal diameter and can reduce pressure. 3  Deposits on dishes and tubs and sinks.
Hardness is caused by compounds of calcium and magnesium, and by a variety of other metals. General guidelines for classification of waters are: 0 to 60 mg/L (milligrams per liter) as calcium carbonate is classified as soft; 61 to 120 mg/L as moderately hard; 121 to 180 mg/L as hard; and more than 180 mg/L as very hard.