  We present observations of the solar chromosphere obtained simultaneously
with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface
Region Imaging Spectrograph (IRIS). The observatories targeted a chromospheric
plage region of which the spatial distribution (split between strongly and
weakly magnetized regions) allowed the study of linear-like structures in
isolation, free of contamination from background emission. Using these
observations in conjunction with a radiative magnetohydrodynamic 2.5D model
covering the upper convection zone all the way to the corona that considers
non-equilibrium ionization effects, we report the detection of an on-disk
chromospheric spicule with ALMA and confirm its multithermal nature.
