Gas masks are impermeable only to certain kinds of gas.
Useful english dictionary. 2012.
per|cep´ti|ble|ness — per|cep|ti|ble «puhr SEHP tuh buhl», adjective. that can be perceived; observable; appreciable: »a perceptible improvement, a perceptible time. The other ship was barely perceptible in the fog. SYNONYM(S): palpable, cognizable.… … Useful english dictionary
per|cep|ti|ble — «puhr SEHP tuh buhl», adjective. that can be perceived; observable; appreciable: »a perceptible improvement, a perceptible time. The other ship was barely perceptible in the fog. SYNONYM(S): palpable, cognizable. –per|cep´ti|ble|ness, noun.… … Useful english dictionary
per´me|a|ble|ness — per|me|a|ble «PUR mee uh buhl», adjective. that can be permeated; allowing the passage or diffusion of liquids or gases through it: »permeable cell walls. A sponge is permeable by water. SYNONYM(S): pervious. ╂[< Latin permeābilis <… … Useful english dictionary
per|me|a|ble — «PUR mee uh buhl», adjective. that can be permeated; allowing the passage or diffusion of liquids or gases through it: »permeable cell walls. A sponge is permeable by water. SYNONYM(S): pervious. ╂[< Latin permeābilis < permeāre; see etym.… … Useful english dictionary
per|mis´si|ble|ness — per|mis|si|ble «puhr MIHS uh buhl», adjective. that can be permitted; allowable. SYNONYM(S): admissible. –per|mis´si|ble|ness, noun. –per|mis´si|bly, adverb … Useful english dictionary
per|mis|si|ble — «puhr MIHS uh buhl», adjective. that can be permitted; allowable. SYNONYM(S): admissible. –per|mis´si|ble|ness, noun. –per|mis´si|bly, adverb … Useful english dictionary
per´son|a|ble|ness — per|son|a|ble «PUR suh nuh buhl», adjective. having a pleasing appearance or personality; attractive: »Miss Ingamells…a personable if somewhat heavy creature of twenty eight (Arnold Bennett). SYNONYM(S): comely, presentable. –per´son|a|ble|ness,… … Useful english dictionary
per|son|a|ble — «PUR suh nuh buhl», adjective. having a pleasing appearance or personality; attractive: »Miss Ingamells…a personable if somewhat heavy creature of twenty eight (Arnold Bennett). SYNONYM(S): comely, presentable. –per´son|a|ble|ness, noun … Useful english dictionary
per|spir´a|ble — per|spire «puhr SPYR», intransitive verb, transitive verb, spired, spir|ing. to sweat: »The lumberman perspired as he cut trees under the blazing sun. ╂[< Latin perspīrāre to blow or breathe constantly (said of the wind) < per through +… … Useful english dictionary
per|turb´a|ble — per|turb «puhr TURB», transitive verb. 1. to disturb greatly; make uneasy or troubled; upset: »Teachers are always perturbed by low grades. Highly perturbed, he wondered what was coming next (Arnold Bennett). SYNONYM(S): excite, trouble, distress … Useful english dictionary
per|ceiv|a|ble — «puhr SEE vuh buhl», adjective. that can be perceived; perceptible. SYNONYM(S): intelligible, appreciable. –per|ceiv´a|bly, adverb … Useful english dictionary
