fishskin

[fish-skin]

noun Slang.

a condom.
a dollar bill.

Origin of fishskin

1645–55, for literal sense; fish + skin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

fish skin in Medicine

fish skin

[fĭsh]

n.

ichthyosis
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.