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Anti-septic:

A substance capable of killing microorganisms by applying externally

Anti-tussive:

Calming or prevents coughing. Par excellence is the cough suppressant codeine, an alkaloid obtained from the Papaver somniferun L.

Antibiotic:

A chemical produced by microorganisms, fungi or by synthetic processes, able to kill or inhibit other microorganisms.

Antidote:

A substance that neutralizes the action of poisons.

Anxiolytic:

A substance that can reduce anxiety, meaning an unpleasant emotional state characterized by: increased heart rate, sweating, trembling, weakness and fatigue.

Apetalous:

Without petals.

Aphrodisiac:

A substance that excites sexual desire.

Appetizer:

A substance capable of opening the appetite. They are usually bitter substances.

Aquatic plants:

Plants that remain a part of it or wholly submerged in the water, both fresh and marine. Most algae are aquatic plants and some fungi and mosses, also some higher plants.

Aqueous:

Which has a large proportion of water.

Ascites:

Accumulation of fluid in the abdomen.

Asthma:

Respiratory disease characterized by fits of poor breathing and coughing.

Astringent:

A substance that acts on the skin or mucous membranes dehydrate the tissue function, thus securing an anti-inflammatory action.

Avitaminosis:

Pathological condition that is caused by a lack of vitamins in the diet. Depending on the type of vitamin in question will result in one or another disease.

Axil:

Angle formed between a leaf or branch and the axis of which part.