Secondary Immunity: Resistance to an antigen the second time it appears. Because of the presence of B and T memory cells produced during the first exposure to the antigen, the second response is faster and more massive and lasts longer than the primary immune response.

 

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Secondary Immunity: Resistance to an antigen the second time it appears. Because of the presence of B and T memory cells produced during the first exposure to the antigen, the second response is faster and more . . . View Full Definition

Secondary Phloem: Phloem produced by the vascular cambium in a woody plant stem or root.

Secondary Prevention: Activities targeted to prevent breakdowns and dysfunctions among families who have been identified as at risk for abuse and neglect.

Secondary Process: In psychoanalytic theory, mental activity and thinking characteristic of the ego and influenced by the demands of the environment. Characterized by organization, systematization, intellectua . . . View Full Definition

Secondary Offering: The most common form of secondary offering occurs when an investor, usually a corporation, but sometimes an individual, sells a large block of stock or other securities it has been holding i . . . View Full Definition

Secondary Mortgage Market: A market for the purchase and sale of existing mortgages, designed to provide greater liquidity for selling mortgages, also called secondary money market, not to be confused with secondary financing.

Secondary Issue: (1) Procedure for selling blocks of seasoned issues of stocks. (2) More generally, sale of already issued stock.

Secondary Macronutrients: Elements that plants require in relatively small quantities: calcium, magnesium, and sulfur.

Secondary Market: When investors buy and sell securities through a brokerage account, the transactions occur on what's known as the secondary market. While the secondary market isn't a place, it includes all . . . View Full Definition

Secondary Mortgage Loan: A mortgage loan that is in addition to a mortgage that already exists on the home.