Interesting etymology:

" Glacial acetic acid is called "glacial" because its freezing point (16.7 C) is only slightly below room temperature. In the (generally unheated) laboratories in which the pure material was first prepared, the acid was often found to have frozen into ice-like crystals. The term "glacial acetic acid" is now taken to refer to pure acetic acid (ethanoic acid) in any physical state."