accrementitial, a. Biol. (ˌækrɪmənˈtɪʃəl) [f. L. *accrēment-um addition (f. accrēsc-ĕre, see accresce; cf. excrēment-um f. excrēsc-ĕre) + īci-us + -al1; see -itial.] Pertaining to accrementition.
Oxford English Dictionary