1) Chemical agent 2) Drier 3) Drying agent 4) Sicative 1) Drier 2) Sicative 
A desiccant is a hygroscopic substance that induces or sustains a state of dryness (desiccation) in its vicinity. Commonly encountered pre-packaged desiccants are solids that absorb water. Desiccants for specialized purposes may be in forms other than solid, and may work through other principles, such as chemical bonding of water molecules. They a...
A desiccant is a hygroscopic substance that induces or sustains a state of dryness (desiccation) in its local vicinity in a moderately-well sealed container.
• (n.) A medicine or application for drying up a sore. • (a.) Drying; desiccative.
(des´ĭ-kәnt) promoting dryness. an agent that promotes dryness.
A substance that induces drying by absorbing water.
A chemical agent that absorbs moisture
A chemical which kills vegetation by inducing rapid desiccation of plant tissue e.g. seed alfalfa or red clover pre-harvest are sprayed with dinitro and oils, usually the foliage is killed by contact action and often seed moisture is reduced, which aids harvest.
De·sic'cant adjective [ Latin desiccans , present participle of desiccare . See Desiccate .] Drying; desiccative. -- noun (Medicine) A medicine or application for drying up a sore. Wiseman. 
substance used to absorb moisture 
Type: Term Pronunciation: des′i-kant Definitions: 1. Drying; causing or promoting dryness. 2. An agent that absorbs moisture; a drying agent. Synonyms: desiccative
[n] - a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)
Substance which can be used for drying purposes because of its affinity for water
A chemical agent that absorbs moisture; some desiccants are capable of drying out plants or insects, causing death. 
drying agent noun a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)
A material used to desiccate (dry) or dehumidify air.
desiccating or drying, as a medicine.