any of three deep-bodied, cichlid fishes, Pterophyllum scalare, P. altum, and P. eimekei, inhabiting northern South American rivers, often kept in aquariums.
Origin of scalare
1925–30; < New Latin; Latin scālāre, neuter of scālāris scalar; from its ladderlike markings
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for scalare
C19: from Latin scālāris of a ladder, scalar, referring to the runglike pattern on its body
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