of or pertaining to clouds composed of ice crystals, as cirrus, cirrostratus, and cirrocumulus clouds
Word origin
[1805–15; cirri- + -form]This word is first recorded in the period 1805–15. Other words that entered Englishat around the same time include: Indo-European, backlash, napoleon, platinum, soufflé-form is a combining form meaning “having the form of”. Other words that use the affix-form include: arcform, moniliform, somatoform, stratiform, villiform