Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of invertebrate is as below...

Retinula :: Retinula (n.) One of the group of pigmented cells which surround the retinophorae of invertebrates. See Illust. under Ommatidium.

Retineum :: Retineum (n.) That part of the eye of an invertebrate which corresponds in function with the retina of a vertebrate.

Ocellus :: Ocellus (n.) A little eye; a minute simple eye found in many invertebrates.

Water Pore :: Water pore () A pore by which the water tubes of various invertebrates open externally.

Enteropneusta :: Enteropneusta (n. pl.) A group of wormlike invertebrates having, along the sides of the body, branchial openings for the branchial sacs, which are formed by diverticula of the alimentary canal. Balanoglossus is the only known genus. See Illustration in Appendix..

Hermaphrodite :: Hermaphrodite (n.) An individual which has the attributes of both male and female, or which unites in itself the two sexes; an animal or plant having the parts of generation of both sexes, as when a flower contains both the stamens and pistil within the same calyx, or on the same receptacle. In some cases reproduction may take place without the union of the distinct individuals. In the animal kingdom true hermaphrodites are found only among the invertebrates. See Illust. in Appendix, under Helmi

Arm :: Arm (n.) A limb, or locomotive or prehensile organ, of an invertebrate animal..

Epizoon :: Epizoon (n.) One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoon. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans..

Pseudo-heart :: Pseudo-heart (n.) Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system..

Vent :: Vent (n.) The anal opening of certain invertebrates and fishes; also, the external cloacal opening of reptiles, birds, amphibians, and many fishes..

Radiata :: Radiata (n. pl.) An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere..

Tentacle :: Tentacle (n.) A more or less elongated process or organ, simple or branched, proceeding from the head or cephalic region of invertebrate animals, being either an organ of sense, prehension, or motion..

Perisome :: Perisome (n.) The entire covering of an invertebrate animal, as echinoderm or coelenterate; the integument..

Testacea :: Testacea (n. pl.) Invertebrate animals covered with shells, especially mollusks; shellfish..

Scale :: Scale (n.) One of the small scalelike structures covering parts of some invertebrates, as those on the wings of Lepidoptera and on the body of Thysanura; the elytra of certain annelids. See Lepidoptera..

Chitin :: Chitin (n.) A white amorphous horny substance forming the harder part of the outer integument of insects, crustacea, and various other invertebrates; entomolin..

Exoskeleton :: Exoskeleton (n.) The hardened parts of the external integument of an animal, including hair, feathers, nails, horns, scales, etc.,as well as the armor of armadillos and many reptiles, and the shells or hardened integument of numerous invertebrates; external skeleton; dermoskeleton..

Skeleton :: Skeleton (n.) The more or less firm or hardened framework of an invertebrate animal.

Pharyngopneusta :: Pharyngopneusta (n. pl.) A group of invertebrates including the Tunicata and Enteropneusta.

Hair :: Hair (n.) A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those of vertebrates in structure, composition, and mode of growth..

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