variant of -able (soluble); occurring first in words of Latin origin that came into English through French, later in words taken directly from Latin.
Origin of -ble
Middle English < Old French < Latin -bilem, accusative of -bilis (masculine and feminine) or < -bile (neuter) adj. suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019