a rule that generates a sentence or other syntactic construction from words and phrases and identifies its constituent structure.
(generative grammar) a rule of the form A → X where A is a syntactic category label, such as noun phrase or sentence, and X is a sequence of such labels and/or morphemes, expressing the fact that A can be replaced by X in generating the constituent structure of a sentence Also called rewrite rule Compare transformational rule
noun 1. Linguistics. a structural representation of a sentence in the form of an inverted tree, with each node of the tree labeled according to the phrasal constituent it represents.
- Photoreceptor cell
photoreceptor cell n.
[foh-toh-ri-kon] /ˌfoʊ toʊ rɪˈkɒn/ noun, adjective, Informal. 1. .
[foh-toh-ri-sep-ter] /ˌfoʊ toʊ rɪˈsɛp tər/ noun, Physiology, Biology. 1. a stimulated by light. /ˌfəʊtəʊrɪˈsɛptə/ noun 1. (zoology, physiol) a light-sensitive cell or organ that conveys impulses through the sensory neuron connected to it photoreceptor pho·to·re·cep·tor (fō’tō-rĭ-sěp’tər) n. A nerve ending, cell, or group of cells specialized to sense or receive light. photoreceptor (fō’tō-rĭ-sěp’tər)