NICTATING MEMBRANE
\nˈɪkte͡ɪtɪŋ mˈɛmbɹe͡ɪn], \nˈɪkteɪtɪŋ mˈɛmbɹeɪn], \n_ˈɪ_k_t_eɪ_t_ɪ_ŋ m_ˈɛ_m_b_ɹ_eɪ_n]\
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The nictating membrane, third eyelid, or haw; a structure highly developed in some of the lower animals, consisting of a fold or reduplication of the conjunctiva, covering a sheet or lamina of fibrocartilage which can be made to advance from the inner and lower side of the lower lid and more or less completely cover the eyeball.
By Smith Ely Jelliffe
Word of the day
fasciculus cerebrospinalis anterior
- cerebrospinal fasciculus, Tuerck's direct pyramidal tract, a subdivision anterior funiculus, or white column, of the spinal cord.