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The human head typically weighs between 2.3 and 5 kilograms (5.1 and 11.0 lb) The face is the anterior part of the head, containing the eyes, nose, and mouth. On either side of the mouth, the cheeks provide a fleshy border to the oral cavity. The ears sit to either side of the head.
Most of these are accompanied by a short description or definition, links to related descriptors, and a list of synonyms or very similar terms (known as entry terms). MeSH contains approximately 30,000 entries (as of 2025 [update] ) and is updated annually to reflect changes in medicine and medical terminology. [ 3 ]
5.1: Liquid Any material which exhibits a mean pressure rise time less than or equal to the pressure rise time of a 1:1 nitric acid (65 percent)/cellulose mixture and the criteria for Packing Group I and II are not met. Group II 5.2: All All Division 5.2 materials do not have a packing group in Column 5 of the 49 CFR 172.101 Table.
statement of medical necessity SMS: senior medical student SMT: spinal manipulative therapy: SMV: superior mesenteric vein: SN: student nurse skilled nursing SNB: sentinel node biopsy (ductal carcinoma) SNF: skilled nursing facility: SNHL: sensorineural hearing loss: SNP: sodium nitroprusside single nucleotide polymorphism: SNRI: serotonin ...
This is a list of roots, suffixes, and prefixes used in medical terminology, their meanings, and their etymologies. Most of them are combining forms in Neo-Latin and hence international scientific vocabulary. There are a few general rules about how they combine.
Many gases have toxic properties, which are often assessed using the LC 50 (median lethal concentration) measure. In the United States, many of these gases have been assigned an NFPA 704 health rating of 4 (may be fatal) or 3 (may cause serious or permanent injury), and/or exposure limits (TLV, TWA/PEL, STEL, or REL) determined by the ACGIH professional association.
A page from Robert James's A Medicinal Dictionary; London, 1743-45 An illustration from Appleton's Medical Dictionary; edited by S. E. Jelliffe (1916). The earliest known glossaries of medical terms were discovered on Egyptian papyrus authored around 1600 B.C. [1] Other precursors to modern medical dictionaries include lists of terms compiled from the Hippocratic Corpus in the first century AD.
The list was amended and republished in Directive 2001/59/EC. [2] The list was subsequently updated and republished in Directive 2006/102/EC. [3] The entirety of Directive 67/548/EEC, including these S-phrases, were superseded completely on 1 June 2015 by Regulation (EC) No 1272/2008 - Classification, Labelling and Packaging Regulations. [1]