Correct spelling for the English word "tranquilizings" is [tɹˈankwɪlˌa͡ɪzɪŋz], [tɹˈankwɪlˌaɪzɪŋz], [t_ɹ_ˈa_n_k_w_ɪ_l_ˌaɪ_z_ɪ_ŋ_z] (IPA phonetic alphabet).
It seems that "tranquilizings" is not a recognized word in English. There is a noun form "tranquilizing" which is derived from the verb "tranquilize". The etymology of "tranquilize" is as follows:
The word "tranquilize" is derived from the Latin word "tranquilus", meaning calm or peaceful. The Latin word "tranquilus" is a combination of "trans" meaning across or over and "quies" meaning rest or quiet.
Therefore, "tranquilize" can be seen as a combination of "trans" and "quies", suggesting the idea of bringing peace or calmness across or over something.