| horns of thyroid cartilage | See: inferior horn of thyroid cartilage, superior horn of thyroid cartilage. (05 Mar 2000) |
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| hornsnake | <zoology> A harmless snake (Farancia abacura), found in the Southern United States. The colour is bluish black above, red below. Source: Websters Dictionary (01 Mar 1998) |
| hornstone | <chemical> A siliceous stone, a variety of quartz, closely resembling flint, but more brittle. Synonym: chert. Source: Websters Dictionary (01 Mar 1998) |
| horntail | <zoology> Any one of family (Uroceridae) of large hyminopterous insects, allied to the sawflies. The larvae bore in the wood of trees. So called from the long, stout ovipositors of the females. Source: Websters Dictionary (01 Mar 1998) |
| hornwort | <botany> An aquatic plant (Ceratophyllum), with finely divided leaves. Source: Websters Dictionary (01 Mar 1998) |
| hornwrack | <zoology> A bryozoan of the genus Flustra. Source: Websters Dictionary (01 Mar 1998) |
| horny | Of the nature or structure of horn. Synonym: corneous, keratic, keratinous, keratoid, keroid. (05 Mar 2000) |
| horny cell | The dead keratin-filled squamous cell of the stratum corneum. Synonym: horny cell, keratinised cell. Origin: cornea, L. Fem. Of corneus, horny, + G. Kytos, cell (05 Mar 2000) |
| horny layer of epidermis | The outer layer of the epidermis, consisting of several layers of flat keratinised non-nucleated cells. Synonym: corneal layer of epidermis, horny layer of epidermis. (05 Mar 2000) |
| horny layer of nail | The outer, horny layer of the nail. Synonym: cornified layer of nail, horny layer of nail. (05 Mar 2000) |
| hornyhead | <zoology> Any North American river chub of the genus Hybopsis, especially. H. Biguttatus. Source: Websters Dictionary (01 Mar 1998) |
| ten Horn's sign | <clinical sign> Pain caused by gentle traction on the right spermatic cord, indicative of appendicitis. (05 Mar 2000) |
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| tip of posterior horn | The pointed extremity of each posterior gray column or cornu of the spinal cord. Synonym: apex cornus posterioris, caput cornus, tip of posterior horn. (05 Mar 2000) |
| uterine horn | cornu uteri |
| lateral horn | The small lateral gray column of the spinal cord as appearing in transverse section containing the interomedial cell column. See: gray columns. Synonym: cornu laterale. (05 Mar 2000) |
| frontal horn | See: inferior horn of lateral ventricle, inferior horn. (05 Mar 2000) |
| lesser horn of hyoid bone | The shorter and more medial of the two processes on either side of the hyoid bone. Synonym: cornu minus ossis hyoidei, styloid cornu. (05 Mar 2000) |