The English word "victim" derives from Latin victima, which specifically describes an animal, usually cattle, slaughtered as a sacrificial offering. Originally the English word meant exactly the same thing, it's only taken its modern meaning of "sufferer" comparatively recently. Greek has a number of words for offerings: θυσία, θύμον, ἱερεῖον (usually in the plural, ἱερεῖα), σφάγιον (also generally plural, σφαγία), ὁλόκαυτος (actually an adjective, usually modifying θυσία), ἑκατόμβη (generally restricted to Homer, technically describing a particular number of victims but also generally public sacrifice). These words all describe animals (or, in the case of some words which describe burnt offerings, grain, fruits, and other agricultural products) except when specified. The Greeks did not practice human sacrifice in the historical period, and even if we accept Burkert's idea that certain rituals were holdovers of a period when human sacrifice was performed, the Greeks certainly did not think of them that way explicitly in their texts. Xenophon is particularly fond of ἱερεῖα, which is derived from the adjective ἱερός, "holy." It's a neuter noun, since it refers to "sacrificial things," whether those are living offerings or produce. It would be extremely unusual for Greek to use a neuter, plural or singular, for an explicitly human subject, except in the case of some collective nouns.

Also it's called the Anabasis, not the Persian Expedition. That's a translator's decision, citing The Persian Expedition would only confuse a classicist