| locant | A number or letter preceding a substituent name in the name of a complex chemical that specifies the position (location) of the substituent on the parent molecule; e.g., 5 in 5-methyluridine, S in S-adenosylmethionine. (05 Mar 2000) |
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| location directories and signs | Directory signs or listings of designated areas within or without a facility. (12 Dec 1998) |
| locator | An instrument or apparatus for finding the position of a foreign object in tissue. (05 Mar 2000) |