mesogen

https://doi.org/10.1351/goldbook.MT06870
A compound that under suitable conditions of temperature, pressure, and concentration can exist as a @M03849@ or, in particular, as a @LT06855@.
Source:
PAC, 2002, 74, 493. (Definitions of basic terms relating to polymer liquid crystals (IUPAC Recommendations 2001)) on page 497 [Terms] [Paper]