What do a.m. and p.m. stand for?

pectoral fin

(in fishes) either of a pair of fins usually situated behind the head, one on each side, and corresponding to the forelimbs of higher vertebrates.
Origin of pectoral fin
1760-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pectoral fin
  • We are also currently investigating underestimation of fish aging using pectoral fin-rays.
  • The pectoral fin is short and does not reach the nostril when bent forward beside the head.
  • The short, rounded pectoral fin does not reach the nostril when bent forward along the head.
  • Fish attributes were recorded and a pectoral fin ray was removed for aging.
  • Short lateral line, not exceeding the length of the pectoral fin.
  • Breeding males develop reddish patches, particularly on the pectoral fin bases.
British Dictionary definitions for pectoral fin

pectoral fin

either of a pair of fins, situated just behind the head in fishes, that help to control the direction of movement during locomotion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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