Definition: A small, flat structure that develops from a spore and contains reproductive organs. It is the early stage in the life cycle of ferns and some other plants.

Example: The prothallus of the fern is essential for reproduction as it produces gametes.

Definition: The act of adding a sound or syllable at the beginning of a word, or a table used for preparing bread and wine in the Eastern Orthodox Church.

Example: In linguistics, prothesis refers to the addition of a phoneme at the start of a word.

Definition: Relating to the addition of a sound or syllable at the beginning of a word.

Example: In some languages, prothetic vowels are added to ease pronunciation.

Definition: Related to the front part of the thorax in certain insects, which is the segment just behind the head.

Example: The prothoracic segment is crucial for the movement of the insect's forelegs.

Definition: The front part of an insect's body that is located just behind the head and supports the first pair of legs.

Example: The prothorax of the beetle is hard and protects its delicate wings.

Definition: A protein in the blood that helps with clotting by being changed into another protein called thrombin.

Example: Prothrombin is essential for the blood clotting process.

Definition: A type of simple organism that is usually made up of a single cell and belongs to a group of living things that are not plants, animals, or fungi.

Example: The pond was full of different kinds of protists, including tiny algae and amoebas.

Definition: Relating to a group of simple, usually microscopic organisms that are not animals, plants, or fungi.

Example: The protistan cells can be found in various aquatic environments.

Definition: The most common form of hydrogen, which has one proton and no neutrons, making it the lightest isotope of hydrogen.

Example: Protium is the simplest and most abundant isotope of hydrogen found in nature.

Definition: The primary tissue in plants that develops into the outer layer, known as the epidermis.

Example: The protoderm is essential for the formation of the plant's protective outer layer.