| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| (noun) a consonant that is articulated using both lips; /p/ or /b/ or /w/ | - |
| bilabiate | (adjective) having two lips | Synonyms: two-lipped |
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| bilateral | (adjective) having two sides or parts | Synonyms: two-sided |
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| (adjective) affecting or undertaken by two parties | - |
| (adjective) having identical parts on each side of an axis | Synonyms: bilaterally symmetric, bilaterally symmetrical, isobilateral |
| bilateralism | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilaterality |
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| bilaterality | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilateralism |
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| bilaterally | (adverb) with the involvement of two parties or governments | - |
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| (adverb) so as to involve two sides or parts | - |