1. (n.) A dividing membrane or thin partition, commonly with an opening through it.

2. (n.) The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.

3. (n.) A calcareous plate which divides the cavity of certain shells into two parts.

4. (n.) A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.

5. (n.) A partition in any compartment, for various purposes.

IUD abdomen abomasum acoustical network bag barrier bay window beerbelly belly birth control device brattice breadbasket buffer buffer state bulkhead bumper capacitor speaker center cloison coaxial speaker collision mat condom cone contraceptive contraceptive foam core craw crop crossover network cushion diameter dissepiment dividing line dividing wall division dynamic speaker earphone electrodynamic speaker electromagnetic speaker electrostatic speaker embonpoint equator excited-field speaker fender first stomach full-fidelity speaker gizzard gullet gut headphone headset heart high-fidelity speaker high-frequency speaker honeycomb stomach horn interior interseptum intrauterine device kernel kishkes loudspeaker low-frequency speaker manyplies mat maw mean median middle midmost midrange speaker midriff midsection midst monorange speaker moving-coil speaker nucleus omasum oral contraceptive pad panel paries partition party wall paunch permanent magnet speaker pessary pot potbelly potgut property line prophylactic psalterium pusgut rennet bag reticulum rubber rumen second stomach separation septulum septum shock pad skin spare tire speaker speaker system speaker unit spermicidal jelly spermicide stomach swagbelly the pill thick thick of things third stomach triaxial speaker tum-tum tummy tweeter underbelly ventripotence voice coil waist waistline wall woofer zone