Alesco, alescis, aléscere, antiquum verbum ab alo, alis, Idem quod nutricari, crescere. Varro. To growe or ware fatte.Alescendi cacumen tangere. Lucret. To be come to the full groweth.
Lewis and Short: Latin dictionary
ălesco, ĕre, v. inch. n. [alo], to grow up, increase (only ante-class.), Varr. R. R. 1, 44, 4; 2, 4, 19: alescendi cacumen, Lucr. 2, 1130.