a. Physiol. Chem. [f. Gr. θύμο-ς THYMUS + NUCLEIC.] Of or pertaining to the nuclein of the thymus gland; in t. acid, either of two or more nucleic acids, which can be isolated from the cells of the thymus.
1911. Dorland, Med. Dict. (ed. 6), Thymonucleic acid, any one of a series of acids which split up into thymin, esp. the compound C25H36N9O20P3.
