S: (n) enzyme (any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions)
S: (n) protein (any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes) "a diet high in protein"
S: (n) compound, chemical compound ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight)
S: (n) explosive (a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck)
S: (n) reactant (a chemical substance that is present at the start of a chemical reaction)
S: (n) Alar, daminozide (a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time)
S: (n) carrier (an inactive substance that is a vehicle for a radioactive tracer of the same substance and that assists in its recovery after some chemical reaction)
S: (n) congener (a minor chemical constituent that gives a wine or liquor its distinctive character)
S: (n) compound, chemical compound ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight)
S: (n) soil conditioner (a chemical substance used to improve the structure of the soil and increase its porosity) "gypsum can be used as a soil conditioner"
S: (n) catalyst, accelerator ((chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected)
S: (n) activator ((biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription)
S: (n) substance (the real physical matter of which a person or thing consists) "DNA is the substance of our genes"
S: (n) matter (that which has mass and occupies space) "physicists study both the nature of matter and the forces which govern it"
S: (n) part, portion, component part, component, constituent (something determined in relation to something that includes it) "he wanted to feel a part of something bigger than himself"; "I read a portion of the manuscript"; "the smaller component is hard to reach"; "the animal constituent of plankton"
S: (n) item, point (a distinct part that can be specified separately in a group of things that could be enumerated on a list) "he noticed an item in the New York Times"; "she had several items on her shopping list"; "the main point on the agenda was taken up first"
S: (n) butt (the part of a plant from which the roots spring or the part of a stalk or trunk nearest the roots)
S: (n) basis, base (the most important or necessary part of something) "the basis of this drink is orange juice"
S: (n) detail, particular, item (a small part that can be considered separately from the whole) "it was perfect in all details"
S: (n) unit (an individual or group or structure or other entity regarded as a structural or functional constituent of a whole) "the reduced the number of units and installations"; "the word is a basic linguistic unit"
S: (n) member (anything that belongs to a set or class) "snakes are members of the class Reptilia"; "members of the opposite sex"
S: (n) remainder, balance, residual, residue, residuum, rest (something left after other parts have been taken away) "there was no remainder"; "he threw away the rest"; "he took what he wanted and I got the balance"