1. (n. pl.) The recesses, or innermost parts, of any thing or place, especially of a temple or palace.

2. (n. pl.) Hidden things or secrets; privacy; sanctuary; as, the sacred penetralia of the home.

bag bear being beloved blood bones boobs boon bottle up bowels breast breasts brisket bury bust cache center center of life cherish cherished chest clasp classify cling to clip close conceal confidential core crop dear deepest recesses deposit dug embosom embrace enfold entertain esoteric reality esprit file and forget fold fondle foster gut guts harbor have have and hold heart heart of hearts heartstrings hide away hold hold on to hold out on hug in petto inmost heart inmost soul inner inner landscape inner life inner man inner nature inner recess inner self innermost being inside interior interior man intern internal intimate intrados inward keep keep back keep between us keep buttoned up keep close keep dark keep from keep hidden keep in ignorance keep mum keep secret keep snug keep under wraps knockers lock up make no sign mama mamelon mamelonation mammary gland mammilla mammillation midst nenes nerve center never let on nipple not give away not tell nurse nurture pair pap papilla penetralia pigeon breast plant play dumb press put away quick recesses seal up secret heart secret place secret places secrete soul special spirit squeeze stash store away stow away teat thorax tit tits titties titty treasure treasure up true being true inwardness udder veil viscera vital center vital principle vitals withhold