from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing, or affected by, the orientation of molecules

from The Century Dictionary and Cyclopedia

  • Of or pertaining to the antennary sense in certain insects, such as the ants, in which a sense of touch or contact is combined with an olfactory sense.


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  • It must be a sense of smell whose range and delicacy we, with our extremely poor olfactory equipment, can but dimly imagine, intermingled inextricably with a sense of tactile form, much as the senses of smell and taste are linked for us. This sense has been called the "topochemical" or "contact-odor" one, and the uses which it serves are immensely varied.

    - Caryl P. Haskins, Of Ants and Men, 1939, p. 60

    December 5, 2008