Unsourced material may be challenged and removed. (June 2013). The dorsal nerve cord is one of the embryonic features unique to chordates, along with a notochord, a post-anal tail, an endostyle, and pharyngeal slits. The dorsal nerve cord is a hollow cord dorsal to the notochord.orsal nerve cord is mainly found in subphylum Vertebrata. Dorsal means the back side, as opposed to Ventral which is the front side of an organism. In organisms with Bipedalism dorsal is the back and ventral is the front.
A quad is a rectangular shaped area, especially on a university campus, that's enclosed by buildings. Your college friend might tell you to meet her in the quad after lunch. Quad is an abbreviation, most commonly short for quadrangle, a kind of four-sided courtyard usually defined by a large lawn and surrounded by buildings. Another kind of quad â also an abbreviation â is the large muscle in the top of your thigh, more formally known as a quadriceps muscle. Quadrangle and its nickname, quad, were 1800's Oxford slang, from the Latin root quadri, or four.
Wiktionary (0.00 / 0 votes) Rate this definition: quadratic (Noun). A quadratic polynomial, function or equation. quadratic (Adjective). square-shaped. quadratic (Adjective). of a polynomial, involving the second power (square) of a variable but no higher powers, as. quadratic (Adjective). of an equation, of the form. quadratic (Adjective). of a function, of the form.