digraph
Noun: 1. A pair of letters representing a single speech sound: A digraph is a combination of two successive letters that together represent one distinct sound (phoneme) that is different from the sounds of the individual letters. This is a fundamental concept in English orthography (spelling). 2. A two-letter symbol: In a broader, non-linguistic context, a digraph can refer to any pair of written characters used as a single unit or symbol.
The term "digraph" is primarily used in the fields of linguistics, phonetics, and language education to describe and analyze spelling patterns. It helps explain the often irregular relationship between spelling and pronunciation in English.
- Linguistic usage:
- The "sh" in "ship" is a digraph representing the /ʃ/ sound.
- The "ch" in "chair" is a digraph representing the /tʃ/ sound.
- The "ea" in "bread" is a vowel digraph representing the /ɛ/ sound.
- The "th" in "thin" is a digraph representing the voiceless /θ/ sound.
- Non-linguistic usage:
- In graph theory, a "digraph" (short for directed graph) is a set of vertices connected by edges with directions.
- Vowel Digraph: A digraph where both letters are vowels (e.g., "oa" in "boat", "ai" in "rain").
- Consonant Digraph: A digraph where both letters are consonants (e.g., "ph" in "phone", "ng" in "sing").
- Split Digraph (or "Magic E"): A pattern where two vowels are separated by a consonant, but the first vowel is typically long, and the final 'e' is silent (e.g., "ae" in "kite"). This is sometimes considered a type of digraph.
- Trigraph: A group of three letters representing a single sound (e.g., "tch" in "catch", "igh" in "night").
- Ligature: A single glyph created by combining two or more letters (e.g., "æ", "œ"), which may or may not represent a digraph sound.
- Directed Graph (Digraph): In mathematics and computer science, this is a common abbreviation for a "directed graph," which is a different concept from the linguistic term.
- Letter pair
- Two-letter combination (specifically for a single sound)
It is crucial to distinguish a digraph from: - A blend (or consonant cluster), where two consonants appear together but each retains its own sound (e.g., "bl" in "black": /b/ + /l/). - A diphthong, which is a complex vowel sound that glides from one vowel position to another within a single syllable (e.g., the /aɪ/ sound in "my"), which may be represented by a digraph (like "oy") but refers specifically to the sound, not the spelling.
- two successive letters (especially two letters used to represent a single sound: `sh' in `shoe')