D defs.my
Entry 2 senses Webster, 1913

Antechamber

/ăn'-tĕch-āmˌ-bẽr/ · An·te·cham·ber · IPA /ˈæn.tiˌt͡ʃeɪm.bɚ/
01 n. A chamber or apartment before the chief apartment and leading into it, in which persons wait for audience; an outer chamber. See Lobby.
  1. 1.
    A chamber or apartment before the chief apartment and leading into it, in which persons wait for audience; an outer chamber. See Lobby. See: Lobby
  2. 2.
    A space viewed as the outer chamber or the entrance to an interior part.
    “The mouth, the antechamber to the digestive canal.” — Todd & Bowman.