Prefixes

thumb|upright=1.3|A comparison of prepositions and directional prefixes in Greek, Latin, English, and German.

thumb|right|alt=The Sanskrit letter Sri|The Sanskrit character in the Devanagari script

Greek prefix: prefix of abstraction

prefices derived from numerals or occasionally other numbers

Wikimedia list article

definite article in Arabic

uniquely decodable code where, given a complete and accurate sequence, a receiver can identify each word without requiring a special marker between words

The prefix thio-, when applied to a chemical, such as an ion, means that an oxygen atom in the compound has been replaced by a sulfur atom. This term is often used in organic chemistry. For example, from the word ether, referring to an oxygen-containing compound having the general chemical structure , where R and R′ are organic functional groups and O is an oxygen atom, comes the word thioether, which refers to an analogous compound with the general structure , where S is a sulfur atom covalently bonded to two organic groups. A chemical reaction involving the replacement of oxygen to sulfur is

Pseudo- (from , ) is a prefix used in a number of languages, often to mark something as a fake or insincere version.

The prefix aza- is used in organic chemistry to form names of organic compounds where a carbon atom is replaced by a nitrogen atom. The related term "deaza-" refers to when a nitrogen is removed and, usually, a carbon atom is put in its place. Sometimes a number between hyphens is inserted before it to state which atom the nitrogen atom replaces. It arose by shortening the word azote, which is an obsolete name for nitrogen in the English language and occurs in current French usage (azote), meaning "nitrogen".

Upasarga is a term used in Sanskrit grammar for a special class of twenty prepositional particles prefixed to verbs or to action nouns. In Vedic, these prepositions are separable from verbs; in classical Sanskrit the prefixing is obligatory.

IEEE standard

placename element in Brythonic languages

thumb|right|The north gate of Cardiff Castle, following the old Roman fortifications and rebuilt along Roman lines.