8 Wintry Words to Defrost Your Vocabulary
1660s, "subservient, subordinate," from Latin ancillaris "relating to maidservants," diminutive of ancilla "handmaid," fem. diminutive of anculus "servant," literally "he who bustles about," from root of ambi- "about" (see ambi-) + PIE *kwol-o-, from root *kwel- "move round, turn about, be much about" (see cycle (n.)).
ancillary an·cil·lar·y (ān'sə-lěr'ē)
Relating to or being auxiliary or secondary.