chordo-, chord-, cordo-, cord- +
(Greek: khorde, "gut string" [of a lyre]; used in an extended sense to mean "sinew, flexible rod-shaped organ, string, cord"; Latin: chorda, "related notes in music, string of a musical instrument, cat-gut" via Old French, corde, "rope, string, twist, cord")
A lancelet has a long body, pointed at both ends, with a large notochord that extends almost from tip to tip and is present throughout its life.
At one end is a mouth surrounded by prominent bristles and leading into a pharynx where there are gill slits, an endostyle similar to that of a sea squirt, and an atrium surrounding the pharynx.
2. A phylum of the animal kingdom consisting of all of the animals that have a notochord (the primitive axis of the body) during some stage of their development.
It includes the subphyla cephalochordata, urochordata, and vertebrata (vertebrates).3. A phylum of animals having a notochord, or dorsal stiffening rod, as the primary internal skeletal support at some stage of their development.
Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
The three features unique to chordates and found in all of them at least during early development are:
- The notochord, composed of gelatinous tissue and bound by a tough membrane.
- A tubular nerve cord (or spinal cord), located above the notochord.
- Gill slits leading into the pharynx, or anterior part of the digestive tract (the throat, in higher vertebrates).
2. A response of body tissues to injury or irritation which is characterized by pain, swelling, redness, and heat.
2. An early keyboard instrument with a soft sound produced by small brass wedges striking horizontal strings.
2. Something consisting of ten parts; for example, a bundle consisting of ten things bound together.
3. An ancient Greek stringed instrument: "In old Grecian times, a heptachord or a lyre with seven chords was used to present music."
2. An ancient acoustic device consisting of a single string stretched over an oblong sounding box, used to determine mathematical intervals between musical tones.
3. An instrument for experimenting with the mathematical relations of musical sounds.
It consists of a single string stretched between two bridges, one or both of which are movable, and which stand on a graduated rule for the purpose of readily changing and measuring the length of the part of the string between them.4. Etymology: Old French, from Late Latin, from Greek monokhordon, from mono-, "one" + khord, "string".
2. A rod consisting of cartilage running underneath, and supporting, the nerve cord.
3. In embryology, a rod-shaped body of cells that is the center of development of the axis of the skeleton.
4. A flexible rodlike structure that forms the main support of the body in all chordates (animals having a notochord, or dorsal stiffening rod) during some stage of their development.
In vertebrates, the notochord develops into a true backbone in the embryonic phase while primitive chordates; such as, lancelets and tunicates, keep a notochord throughout their existence.
2. A series of eight notes; especially, a musical scale.
2. An order or system of five sounds.