1879 H. Calderwood iii. 42 This terminal expansion [of a nerve] is known as an end-bulb, or touch organ.
1887 V. 150/2 In the clitoris these end-bulbs (genital end-bulbs)..are round, elongated, or oval.
1898 (ed. 2) 1076 The spheroidal end-bulbs of Krause, found in the conjunctiva and mucous membrane.