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geniohyoid
geniohyoid adj. and n. 
/dʒᵻˌnʌɪə(ʊ)ˈhʌɪɔɪd/, /dʒᵻˌniːə(ʊ)ˈhʌɪɔɪd/, /dʒəˌnaɪoʊˈhaɪˌɔɪd/ [after post-classical Latin geniohyoideus (1604 or earlier); compare hyoid adj.] (a) adj. designating a narrow muscle originating from the inferior genial tubercle and inserting onto the body of the hyoid bone, which acts to draw the hyoid bone forwards and to depress the jaw; of or relating to this muscle; (b) n. the geniohyoid muscle.
Brit. /ˌdʒiːnɪə(ʊ)ˈhʌɪɔɪd/
, /ˌdʒiːnɪə(ʊ)ˈhʌɪɔɪd//dʒᵻˌnʌɪə(ʊ)ˈhʌɪɔɪd//dʒᵻˌniːə(ʊ)ˈhʌɪɔɪd/U.S. /ˌdʒinioʊˈhaɪˌɔɪd/
, /ˌdʒinioʊˈhaɪˌɔɪd//dʒəˌnaɪoʊˈhaɪˌɔɪd/ΚΠ
1817 J. Cross Attempt Physiognomy Sci. Princ. 185 The lower jaw is deepest at the chin, because this part is drawn downwards by the mylohyoid, genio-hyoid, and digastric muscles.
1873 St. G. Mivart Lessons Elem. Anat. viii. 287 The genio-hyoid is narrow, and goes from the hyoid to the mandible inside the symphysis.
1885 New Sydenham Soc. Lexicon Geniohyoid nerve, a branch given off by the hypoglossal nerve as it lies beneath the mylohyoid muscle.
1939 T. L. Green Pract. Animal Biol. i. 149 The nerve can be found as a sinuous thread in the median line between the genio-hyoid and hyoglossus muscles.
1984 J. Joseph Aids to Anat. (ed. 13) vii. 267 This branch, and those to thyrohyoid and geniohyoid, do not arise from [the] hypoglossal nucleus.
2007 G. de Iuliis & D. Pulerà Dissection Vertebr. vii. 179/1 The thin, narrow geniohyoid muscles..extend anteroposteriorly next to each other at the midline.
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