Strong's H6363 · Hebrew

peter

peh'-ter

or pitrah {pit-raw'}; from 6362; a fissure, i.e. (concretely) firstling (as opening the matrix)

Scholarly Lexicons

Brown-Driver-Briggs (BDB)

 H6363a פֶּ֫טֶר that which separates , first opens H6363b פִּתְרָה id. [ 6363a ]  

Brown-Driver-Briggs Hebrew Lexicon (BDB), 1906 — public domain