"a breathing hole or vent, channel for air," c. 1400, from Old French souspirail, from Latin suspiraclum, from suspirare "draw a deep breath" (see suspire).
Entries linking to suspiral
suspire v.
mid-15c., suspiren, "to sigh," from Old French souspirer (Modern French soupirer), or directly from Latin suspirare "to draw a deep breath, heave a sigh," from assimilated form of sub "under" (see sub-) + spirare "to breathe" (see spirit (n.)). By c. 1500 in the figurative sense of "yearn for, aspire." Related: Suspired; suspiring; suspirious.